Toribash
Check the system logs, and give us the errors.

If its Vista or Windows 7 go to start menu, then write "event viewer". Press enter.

Then in Windows Events look for System and Application errors. That might help you find out what is happening.

If its XP then: Control panel -» Administrative tools -» Event viewer. Then look for System and Application errors around the time of the reboots.

Post it here.
"There is enough on earth for everybody's need, but not for everyone's greed." - Mohandas Gandhi
My computer is in spanish so I haven't checked, my internet in browsers is extremely slow too, and seems like I am using a proxy all the time, which I don't know why.
For slowness, delete temp. files/history and do a hard drive defragmentation.

For the PC reboot problem, check how much stuff IRC is taking up via windows task manager, and try running it with all other programs closed.
I think it is a virus, because in the same computer I am using Ubuntu at this very moment and it works just fine, faster than with Windows.

How can I get it removed, I hate nod32 because it is useless and kaspersky crashes my explorer.exe .