Can't map drive to VPN

Here's my setup... I have a VPN running on a Linksys WRT160N router w/ DD-WRT (v24-sp2) at my client's office. I'm trying to get the Boss's laptop connected and mapped to their one share. The server I'm trying to map to is running Windows SBS 2008... it is running a domain, but since most of PCs in the office are some 'home' version of XP or Vista (they're a non-profit, so that take what they can get), it's not your typical domain environment. The PC connects to the VPN fine, and with an appropriate host entry, it can ping the server by name. It just doesn't map.
In my testing, I've successfully connected, mapped a drive and browsed on three other machines (2 XP & 1 Vista). All three required the host entry.

I think the key to the problem is in the fact that the three machines that were successful prompted me to log into the server in the mapping process, as the credentials for the VPN aren't the same as the credentials for the server. The non-working PC doesn't prompt me for the second set of credentials. I've tried creating a new local user on the pc, per chance there is some saved credentials somewhere. And I've tried the "use different credentials" option when mapping the drive, nothing seems to work. How can I get Vista to prompt for the appropriate credentials.

Any help would be greatly appreciated.
msatterleeAsked:
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Jackie ManCommented:
What is the OS of the laptop? Vista Business or Vista Home Premium?
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msatterleeAuthor Commented:
Home Premium
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msatterleeAuthor Commented:
I just chatted with the owner of the Vista machine that I tested on to verify what her version of vista was... hers was home premium also... and hers was one of the other three systems that worked fine.
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Jackie ManCommented:
So, the e non-working PC can map  a drive and browsed on three other machines (2 XP & 1 Vista)? Just cannot map a drive on Windows SBS 2008?
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msatterleeAuthor Commented:
No. The non working pc can connect to the vpn, and can ping the SBS server, but it can't map or browse the contents of the server.

The three other machines can connect, map, and browse the share on the SBS server
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Jackie ManCommented:
When the non working pc can connect to the vpn, run the following command in DOS prompt of Vista.

ipconfig /all >results.txt

Post the content inside results.txt back and we can see what is the problem.

Source: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/Windows_Vista/Q_25269974.html

When you can ping a computer, but cannot map it or browse it, try the following:-

1. Check DNS
    ipconfig /all

2. Reset Winsock and TCP/IP stack

    "For XP, Start, Run, CMD to open a command prompt.

     For Vista, Start, Programs\Accessories and right click on Command Prompt, select "Run as   Administrator" to open a command prompt.

    Reset WINSOCK entries to installation defaults: netsh winsock reset catalog

    Reset TCP/IP stack to installation defaults. netsh int ip reset reset.log

    Reboot the machine."

Source: http://forums.techguy.org/networking/597129-solved-netbios-disabled-unable-clear.html

3. Disable firewall and anti-virus software to see whether the map or browse service have been blocked

4.  Disable ipv6 in TCP/IP setting of the network interface card.

5. Check whether Computer Browser service is enabled.

    Right-click "My Computer" -> Select "Manage" -> Go to "Services" and browse for "Computer Browser"

    Right-click "Computer Browser" and select "Properties" and set the service to be Automatic in the Startup Type and enable it.

    Restart Computer

Source: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/XP/Q_25353575.html
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msatterleeAuthor Commented:
I've pasted below the ipconfig /all results. One thing I noticed was that her connection didn't have a gateway, when another laptop connected to the same VPN did. I tried all your suggestions and the problem persists.

Windows IP Configuration

   Host Name . . . . . . . . . . . . : DeniseThornt-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : no.cox.net

PPP adapter BOH VPN Connection:

   Connection-specific DNS Suffix  . : no.cox.net
   Description . . . . . . . . . . . : BOH VPN Connection
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.200(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.255
   Default Gateway . . . . . . . . . : 0.0.0.0
   DNS Servers . . . . . . . . . . . : 192.168.1.1
                                       192.168.1.1
                                       192.168.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : no.cox.net
   Description . . . . . . . . . . . : Broadcom 802.11b/g WLAN
   Physical Address. . . . . . . . . : 00-21-00-01-4D-BB
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::5c6e:452f:e095:6601%13(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.0.10(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, April 28, 2010 2:04:54 PM
   Lease Expires . . . . . . . . . . : Wednesday, April 28, 2010 3:04:39 PM
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCP Server . . . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 402661632
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-0F-69-2F-49-00-1E-68-2C-CB-4B
   DNS Servers . . . . . . . . . . . : 68.105.28.11
                                       68.105.29.11
                                       68.105.28.12
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
   Physical Address. . . . . . . . . : 00-1E-37-B9-DD-53
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek RTL8101E Family PCI-E Fast Ethernet NIC (NDIS 6.0)
   Physical Address. . . . . . . . . : 00-1E-68-2C-CB-4B
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 6:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{93C85928-EA2C-4C7D-BFF8-3BC2B64A7154}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 7:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : 6TO4 Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 11:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 02-00-54-55-4E-01
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e74:3c60:257f:3f57:fe37(Preferred)
   Link-local IPv6 Address . . . . . : fe80::3c60:257f:3f57:fe37%16(Preferred)
   Default Gateway . . . . . . . . . : ::
   NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 18:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 13:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{1C11AE53-28A5-4AC7-BA9F-CD4109D7856C}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 14:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : no.cox.net
   Description . . . . . . . . . . . : isatap.no.cox.net
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 15:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : isatap.{63DB97E9-DD82-42FB-9C14-24DDA4A72018}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
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