Its working fine now, I think i found the problem my sister downloaded a file from a website that when scanned was a trojan so I removed the file and now the computer is much faster.
Thats not the problem. Trojans dont freeze systems....they log. They can log if they freeze asydtem. Now....tell me how much ram this laptop has according to Windows.
So you have a 64 bit version of Windows 7 running on 4 GB of ram. SO far so good.
Now, when installing the drivers...did you install the 32 bit or 64 bit versions of the drivers? Chances are...you ave installed incompatible drivers. With that said...
Go there, and download the WIndows 7 64 bit drivers. Use device manager to uninstall all current drivers, and then begin reinstalling. Start with your graphics driver.