It sounds like something is using resources when you say that even typing is being delayed, I would certainly be looking at a full malware scan, Malwarebytes, your antivirus, and possibly also a run of Superantispyware, that quite often pulls stuff that others miss.

A look at Windows Task Manager would possibly be a good idea to see if the process using the resources can be spotted. Press Ctrl, Alt, and Delete this will bring up the task manager, click the processes tab, then scroll down the list, the only thing that should have a high figure is the bottom System Idle Process.
Also a look at the actual performance graph and see if processor usage is high click performance tab for that.

Last edited by Cornet Nev; 06/15/10 08:36 AM.