What files control the mouse in windows xp

Most likely mouse.sys, but I don't think that is the problem. Can you use the tab key once in MSE to advance to the next control, then just hit the enter key when you are on the correct control button.

What and where is MSE?? thanks

MSE = Microsoft Security Essentials

Didn't you say you are trying to update it but can't scroll the window?

You probably have an issues with the built-in mouse or trackpad. Does the scroll work OK when you use the laptop mouse? Knowing what files control the mouse won't do you much, what were you going to do when you found them? Unless you don't mean what you wrote.

sorry for the confusion, microsoft essentials won't let me update.. The mouse situation is separate. When using the remote mouse or even the keyboard the viewing page keeps scrolling back to the previous page.

So, is it all windows that scroll back or just your browser? Have you tried a different browser? I think the important thing is to get rid of the virus first. If possible, downoad malwarebytes or superantispyware and see if you can get rid of it.

http://www.superantispyware.com/

http://www.malwarebytes.org/

Does this happen in all applications or just the internet browser? If you have a word document and you scroll down, does it scroll back up? That would be an issue with a key stuck or the trackpad side scroll if you have that.

MSE comes up with an error when it tries to scan for virus and definition update

no, both mouse's (mice) have the same problem, they both go back to the first page automatically..