Computer freezes within 30 minutes of start up!

Alrighty... The title pretty much says what this will be about. I understand vista stinks but i really wish fix this frustrating problem and be able to keep the memory on my computer.<br>I'm sure it's not a virus because my scanning program has detected nothing. I tried changing the power settings and such like people I have come across suggested, but no such luck.<br>I tried doing backup restore in order to return to a safer time in my computers history, no luck.<br>I've also tried to get rid of so many start up programs to help, but nothing works.<br>I am honestly at my wits end with this computer. It has worked beautifully until now and I'm absolutely frustrated with it anymore because of this freezing problem. Please, anyone who can lend any help or advice, I'm about to throw this dang computer out the window. It's been about 4 months since the problem started and I want it to end ASAP.

Welcome
Here are the most common causes of freezing
Windows 7 Freezes Up - Windows 7 Forums