I just reinstalled Windows XP Pro X64 and everytime I run the speedtest now the 5 meg speed test stops halfway through.

Current settings:
RWIN = 1045440
MTU = 1500

I have fios 20/5 package. Other machine completes the test fine.

I can complete other tests ok but the speed is a little lower than before the reinstall.

Anyone have any idea what might be going on?

I tried Verizon's registry file but it did not seem to change anything.