Can connect VPN wired but not wirelessly on D-Link router

I have a Dell Latitude laptop, D-Link DI624M router and cable modem.  Running Windows XP Pro SP2 with Checkpoint VPN.
I can connect to VPN when wired to the router, but not wirelessly.  I am able to surf the net wirelessly.  I'm positive I was able to connect VPN wirelessly before, but that was probably with my Netgear router, which I trashed because it dropped connections.  

Also, strangely, I do not see the wireless status in my system tray, not do I see the wireless connection in "My Network Connections".  Also, nothing appears when I try to view Device Manager.  So I have no way to view anything regarding my wirless connection, but it definitely connects me to the web.  

I went to the DLink site but found no useful info regarding this router and VPN.

It's been several months since I tried VPN wirelessly and since then I've installed the following to this laptop:
Visual Studio 2005 Pro
.NET Framework 2.0
Toad for Oracle
Toad for SQL
Windows Services for Unix 3.5

Windows Firewall is turned off.

I've already called site support at work and they could not help. I went to the DLink site but found no useful info regarding this router and VPN.  Offering 250 points.
Thanks for any help
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Rob WilliamsCommented:
Some routers do not support the necessary protocols such as IPSec over the wireless connection, you should be able to check that in the specs or by contacting the manufacturer. But also some times there is conflict between the VPN encryption and the wireless encryption causing some issues. For test purposes try disabling wireless encryption or at least lower the encryption level an see if you have any better success.

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Rob WilliamsCommented:
Thanks bozworthy,
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