My VAIO Laptop screen keeps freezing when i run windows normally

Restoring the computer back to factory settings would be the smartest thing to do. but its not a solution. i would recommend that try to reinstall the os and create a parition and save all your information on the other partition. Not on C but anywhere on D, E etc. or you can use an external hdd for this purpose which will back up your information automatically. so you wont think twice restoring it back to factory settings. if you are using windows vista. i suggest turn off automatic updates. because updates causes lot of issues than they resolve.
so as of now you may restore it back to factory settings and turn off the updates. this will certainely work out. SONY's laptop si a good laptop and it hardly cause any hardware problem. so its just vista.
The fool proof option is
Install XP and say good bye to all crashes. ;)
All the best.

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If your screen freezes after a normal startup, it sounds like a memory problem.
If you have a virus problem or currpt or missing files, you will experence the same problems.
Depending upon how much memory you have and what programs are loading when computer starts, is important.
Reloading you software will only prolong the problems and they will return.
At the run window on xp, Type msconfig enter, tag mormal startup on the fisrt line. and in the upper right hit startup next to tools.
Next you will see a list of programs that startup will unit boots.
Remove anything that says, adware or any known programs that you know should not be running.
You can go to microsoft for much more infomation on this.
Good luck