You will need to reinstall mobo, chipset, etc... drivers if Windows 7 doesn't install them itself. Windows 7 has many legacy drivers on hand to get you through an OS reinstall. The OEM version Windows 7 DVD may even contain them - put there by the manufacturer. The system certainly is of no real value to you as it is now, so I would follow the advice of the others - wipe the drive and reinstall Windows 7.
For a complete format, use KillDisk --> Active@ Kill Disk. Hard Drives Eraser. Free Download.
Use ImgBurn to burn KillDisk ISO to CD --> The Official ImgBurn Website
See what happens during the installation, which should take < 1 hour of SYSTEM time. The worst that can happen is that you have to do it again should you find that drivers are needed during the installation. I myself have never had to install drivers during a Vista or Windows 7 installation. I certainly cannot say that no one does. I do go to Intel for chipset and wifi updates, NVIDIA for video, Realtek for Ethernet, etc... but usually they come in via Windows Updates, but not all.
When you reach Desktop, allow Windows Updates to come in immediately. www.update.microsoft.com
Validate your OS and Office at the Microsoft WGA site --> www.microsoft.com/genuine
I would also caution against the use of NIS/ N360. Do a search of this or other forums and you will find them littered with BSOD/ other problem threads where a 3rd party firewall like the one found in NIS, N360, KIS, McAfee, etc... is the cause of the system trouble.
I would suggest Microsoft Security Essentials --> http://www.microsoft.com/security_essentials/
That is your call to make, of course.
Any ? - please post back.
Regards. . .