Thread: The corrupt downloads

I’m having a problems with some file downloads, mainly .exe. Sometimes have bad crc check, othertimes downloads but when unpacking prompts corrupt. (i.e. on Nvidia graphics driver). I have even done reinstallation of windows, fitted new network card/cable, tried various browsers, booted seperatley with my memory sticks, deactivated anti-virus and firewall, ran superspyware & kapersky virus check. My router has a firewall, but can't deactivate?

Need solution.
comp specs:
p4m900t motherboard
9500gt geforce grapics
3.2 gig dual intel processor
3 gig ram
xp 64bit os
dg834n router

Most of the time application files (.exe), driver updates. Such as NVIDIA graphics driver update for one, from nvidia.com (England & America), I have tried other sites (filehippo etc.) And some zip files, I have tried various unzip applications.