Windows 7 SP1 Internet Download Issues

Internet Connectivity Issues
System Information:
Dell Vostro 230
Windows 7 Professional 64-bit
Norton Internet Security 2011

Issues:
There have been no changes to network infrastructure or internet connection.
Since installing SP1 on the PC's the following issues occur.
Randomly throttled internet speed
Downloads hang up multiple times or do not download at all
Uploading does not work, uploading an attachment to Gmail for example, freezes any browser
Outlook is not able to send and receive emails (This all still works fine on the 6 Windows
XP machines on the network)

Users have had issues download and uploading files since upgrading to Windows 7 SP1.
Outlook broke on multiple computers following the upgrade to Windows 7 SP1.
Users are using a combination of Outlook 2003 and Outlook 2010. Two users with 2010 have no issues with send/receive. Attempted to reinstall Outlook 2003 and also upgrade to 2010 on the affected machines but it did not help with the send/receive issues.

Sites such as YouTube randomly do not load, when they do load the streaming media either buffers indefinitely or does not play at all.

Sites with images usually load very slowly, most of the time images do not load correctly.

A PC with the Outlook issue was reformatted, the send/receive issue was resolved but the connectivity issue still exists. Different MTU settings on the Windows 7 machines have been tested but so far have not changed anything with the internet connectivity issues.

Hopefully others have seen these issues.  
Any help would be greatly appreciated.
jtay007Asked:
Who is Participating?
 
jtay007Connect With a Mentor Author Commented:
My son figured it out.  Disabling Windows 7 TCP Auto Tuning fixed it. Not sure what the root cause was though.
http://www.sevenforums.com/network-sharing/74556-enable-disable-tcp-auto-tuning.html
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ucando1Commented:


Remove Norton, see if the problem still exists,

if still present

Disable windows firewall

if still present

Let us know
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maharajgsCommented:
Try using any open dns and try.

Regards
Srinivas
virtutechindia.com
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jtay007Author Commented:
Found own solution
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