super mouse

I have a logitech value optical mouse PS/2 that jumps around all the time. It started jumping more and more and I'm very annoyed cuz i keep getting killed in CSS because of this. Is this a problem with the mouse itself? My dad have the same one and it works fine on his computer.

my specs

AMD 3200+
MSI k8N neo4-f
patriot signature 2x512mb
6800GS
WIn XP (no SP, is this the problem?)

Thanks

it is doing it all the time starting today....weird

no spyware or adware what so ever, i just put together my system and i've made sure all processes are clean.

could it be the mouse pad??? I have a crap one that's plastic and i read somewhere you need ones with texture.

i have a G7 Wireless mouse and can't beleive how good it is...its the best mouse I ever had, and I can change its speed on the fly and the batteries don't die too quick...though I wear them out of power faster than they should for "normal" gaming. I think Logitech thinks that 2 hours a day is "normal"...I do about 6...>.<

I've seen this with a lot of Dell mice recently, which I think might be Logitech in disguise. They just randomly jump around and it really pisses you off. Yea, that is deadly in FPS games. If a different mouse surface doesn't fix it, buy a good mouse like an MS Intellimouse optical or a high-end Logitech optical/laser mouse. Never had a MS mouse jump on me. Life is too short to deal with a POS mouse.