You can do a pretty easy test to see if it's maybe just a toasted Windows install.
Burn a bootable LiveCD (or USB thumb drive) with it's own operating system that doesn't need to use the HDD or Windows.
If it can run well you can narrow things down to the HDD or Windows installation.
It's not windows - but enough alike you can probably browser your HDD to find and locate any personal data or files you may not have backed up.
Tap on the F12 key at power on and choose the CD/DVD or USB device to boot from.
For the CD - use the TRY It option. A USB stick is quite a bit faster loading.