mouse help moving screen

i wonder if any one can help, i`ve come home tonight and when i try and type somthing or scroll down on my wheel mouse the screen moves up and down in places i don`t want it to, its really strange and its getting on my nerves now, please help

clean it out if it's a mechanical mouse..

reinstall drivers..

a trojan or a virus is entirely possible

if it's wireless, batteries may be in order...

geesh, you've really got to provide more info for anyone to give an intelligent answer.

What mouse?

Did you try rebooting?

mroe info..
what do you mean it's moving all over the screen? like the cursor moves or random bits of a window are moving?

made sure you are clicked on the area you are trying to scroll/type in?