Have a careful look at the process tab in the windows task manager - see is anything other the system idel process is using resorces
Except for the lousey resolution does the pc work okay in safe mode ?
If it does work okay go to Start > RUN... and type "msconfig" and start playing with the diagnostic startup & selective startup
Also have a look at items in the startup tab
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by: optomaPosted on 2009-11-04 at 14:39:29ID: 25744846
It could be malware/virus so run these to rule that out: g/mbam-dow nload.php /hitmanpro (you van uninstall it after a restart) hijackthis / (upload this logfile here)
Malwarebytes http://www.malwarebytes.or
http://www.surfright.nl/en
Hijackthis http://free.antivirus.com/