seems, your best bet would be to do a fresh install of your system.
before doing that you need to identify what your computer is and what hardware it has to identify what drivers are needed to reinstall on your system.
is the system a known make, ie dell, toshiba, hp etc.?
is the system a laptop or desktop/tower?
do you have an operating system install disk for the computer concerned?
to identify what laptop, if it is one will have a lable underneath it with some numbers on.
if it's a desk top there maybe a lable on the top or side with details on.
if not, you may be able to identify what hardware is installed by doing the following
in the run box type dxdiag
this will do a system scan of your system
along the botom of the window that comes up there is a 'save all information...' button.
click on that and save to desktop.
open the file and copy/paste this information in a reply back here.
we'll be able to determine what drivers you require for your motherboard etc to rebuild your system after you have done a fresh install of your system.