Computer won't respond

[Hulk]

I can log in without a problem, after I type in my password I get to the desktop but then my computer does not respond to any of the keys I press. I know the keyboard is working because when I hit the scroll lock, etc. keys the green lights on the keyboard light up.

I think I may have a virus. But the thing is I cannot do anything! I can't even hit control alt delete. How do I fix this?

Also, the mouse won't work either. When I double click on an icon nothing happens.

 

[ganesh21]

Most likely at startup, an application is trying to startup.

Boot into safe mode.
Click Window Key + R
Type msconfig
Disable all files at startup that you do not need. ***Please be careful of the file you disable from startup.
Restart PC in normal mode.
Check all application you disable and see which one is the problem.

 

[engiNURD]

Now, when he says be careful, lookup the process online before disabling it.

 

[MR_PERFECT]

Rerun windows,thats what I do.But thats what I love about daily backups.