No display on monitor after POST screen

So basically, i turned off my computer in order to install a new gfx card. Upon installation, i noticed that i turned my computer off during a windows update, so that has corrupted the system file classpnp.sys. I have figured out how to resolve this issue, but i am unable to because whenever i try and boot anything, from Ubuntu to the windows repair tool to the Windows 7 CD i have. It will display BIOS and the POST screen, even the menu when you press F8. I cannot boot in safe mode due to classpnp.sys being corrupt, and whenever i choose start windows normally the OS gets stuck at the "Starting windows" splash. I am quite stumped as to why this is happening, i have tried taking out my gfx card (nVidia 8600GT pci-e) and switching back to onboard graphics. I have also played around with BIOS settings but no avail.

Hopefully you can shed some light on this, thanks, Sam.