Hi Teragen and welcome to TSF
It is probably best to start from scratch, deleting those folders will delete the bulk of the old installation but other issues may come along with that. I would recommend formatting the whole drive over, then reinstalling Windows.
I would like you to run Killdisk
on your machine to format it thoroughly, and reinstall your Windows/Mac/Linux Installation. Just download the ISO from the website and burn it with Nero or another program. Then set your machine to boot up from the CD Drive, and insert the disk. Then just choose your drive that you want to format and follow the on-screen instructions. Make sure to disconnect ALL
other drives that are connected to fend away mistakes that might be made.
Then try to install the drivers once again, I think it should work after a good format and install.