I have a VAIO laptop and it was working fine for a year then all of a sudden it started to freeze after 5-10 minutes after start up. I havent made any changes and the last thing to be downloaded was an ebook from my local libary website. I have tried running the laptop in safe mode but even then after about an hour the laptop freezes. I have tried the following fixes: i run a virus scan and the scan come back clean. I have run a check disk which completed with no errors. I have deleted all tempory files and internet cookies. I have even stopped all start up programs, yet none of this has seemed to help. what else can i try???