Hi, I am no expert but Temperature seems a bit high, check and make sure all fans are working fully and blades are clean. Open side of tower assuming it is a tower, and if you have a portable desk-type fan apply that too. Run Scandisk again, but do not do the thorough scan, just the ordinary scan. Once you have been able to do a scan you should then be able to do the defrag too. If you can get through all that then I would advise a full anti-virus scan and also a scan with Ad-Aware.