I am sending huge ammounts of data

[wackers]

without any browser open huge ammounts of data is pumping out of my computer when connected to internet. WHY!
I have installed Zone Alarm Firewall and have allowed no program to access internet.
I am also receiving a lot of data but not as much as I am sending.
It causes my connection to slow to a halt.
How can I stop it?
What is going on.
AVG Scan reveals no virus.
Running Windows XP.

[gussery]

Download, install, and run some Anti-Spyware software.

Either or both of these work well and the price is right...Free...

http://www.microsoft.com/downloads/details.aspx?FamilyID=321cd7a2-6a57-4c57-a8bd-dbf62eda9671&displaylang=en

http://www.spybot.info/en/index.html

[wackers]

Thanks - I have run spyware.
It finds 1 particular thing each time but when I have it repair and destroy, it is still there next time - (I can't tell you what it is right now as I am at home and the problem is with my work computer)
Maybe here lies the problem? I must investigate this I guess
Thanks again

[Flame]

Are you talking about Microsoft AntiSpyware or Spybot? (Microsoft is better)

[glb]Flame[/glb]

[cigarman]

Does that fix DoS attack, large amount of data being sent is a sign of Denial of Service attack, your bandwidth/cpu being bogged down and no resources to do anything else on your PC

[cigarman]

use a port scanner, find out which port is being used to send the large data, block that port and zap the hacker