You shouldn't randomly delete files and use driver sweepers etc. Now that you f***ed up the system, you should probably reinstall it.
The thing you should have done:
Boot the computer and keep pressing F8 until you see a menu. You usually use this menu to select safe mode. However, now you must use VGA mode (640x480). It's a few lines below safe mode. Start the computer in VGA mode and set a resolution your monitor supports. Done.
CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: Chili Green Vision L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition
CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Fedora 18