this is a wierd problem, i just reinstalled windows on my pc and guess what, i cant upload again. i'm off to uninstall that damned hotfix again.
Just wanted to add that if anyone here is using a netgear dg834g router then the mtu u should use for your pc's is 1500, lan setting. there is a setting in your router for adsl mtu - mine is set to 1478 in there and doesnt get affected by the hotfix obviously, so therefore i think mtu has nothing to do with the problem. I am still investigating