Startup windows 7 splash screen freezes during boot.After booting many times by pressing the power button, sometimes i get lucky and windows then boots normally.But then the problem comes that while working, randomly black screen appears and the system freezes and i have to press power button to shut it down and again then windows startup problem occurs again. I have re-installed new windows a number of times but the problem persists.
Also this problem started when i recently replaced my old battery with a new one. Also the current date and time often changes back to the time of factory setting time due to this bootup issue.I think there's a problem with my system clock. Please guide.
DM4-3000tx
Windows 7 64 bit