An Really old one im buyed not new,an its maybe 5 year old.
yea im reinstaled windows 7 but still same problem
edit my laptop toshiba setelite l500d
UPDATE:
Its seems the problem is in the power plans,when i turn plan for high performance this problem still persists me,and when i turn power saver mode,its like fixed it,for the time being. any idea,what it can be? and why re-instaling windows didint help?