can't upload with Windows XP

I have problems with Mozilla Firefox. i am trying to upload a video to a website and every time i try it times out and says the file was not received. the upload meter doesn't move at all. when i open up "Javascript Console" after trying to upload, i see the error message which reads:

"windows.attachEvent is not a function"

i don't know what to do with this information, but i'm sure it relates to my being upload.

i've also found my peer-to-peer programs are very slow. i tried the "lvllord" patch, to open up more ports. i ran it and it didn't help. i also tried uploading with Netscape Navigator. uploads time out just the same.

i am running Windows XP with SP2, 1.28 GB RAM

I have Sygate Firewall and Antivir, but I also tried uploading with these disabled, and it still doesn't work.

please help!