Ali_baba;
What Anti virus are you running ?
Check to see what is the highest bytes being used in takmanager processess is and tell us what is using the most of the cpu make sure you select the checkbox show processess for all users ?
what was the reasion for the format in the first place ?
you could also do a run to check the processess a processess libary
http://www.processlibrary.com/processscan/press on instant scan and it will give you a report and if any viruses are attached it will tell you
Have you had a bleeps at start up ?
is the fan making Load noises ?
I could be a hardware problem but most likeing a software problem
if you do not have a Anti Virus I suggest you get one and run some scans
download avast free Here
http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.htmlinstall it and register it and once registard run a virus scan
it only takes seconds to get hit if you do not have any av
also I recommend Kerperky as a top AV here
http://www.kaspersky.co.uk/kiskav2010?THRU&reseller=43018&gclid=CJnZ6b7ev6ICFVOY2AodRio26Qget protected if you are not once the scan has finished let us know of the findings
BJseal91