Hundreds of people have used the procedure, and it did work for most of them. Not all for various reasons.
Did you run the registry cleaner (I recommend Ccleaner, but most will work). And did you reboot both before and after running the cleaner? (Very Important)
Here is why: after uninstalling and deleting everything, rebooting allows Windows to mark any registry references that no longer point to a program as 'orphans' The cleaning program removes these orphans as part of it's cleaning process. Then rebooting again _ it will take slightly longer to reboot this time as it has to rebuild the parts of the registry that were cleaned, filling in all of the gaps left by the cleaning and removing the last vestiges of the game from your system. - It fixes a lot of other things as well and could actually speed up your system when not playing the game.
If you don't reboot, then some stray references will be left behind. Doing a manual registry cleaning could miss some entries. Then running the disk cleanup and defrag makes it easier on the reinstall. You will have large areas of contiguous free space to install to instead of pieces being installed all over the drive.
Also, are you installing to the default location? or a custom location? Try the default. I have seen problems when installing to a virtual disk.
The useless anti piracy 'feature' included in the game will prevent it being loaded if you have certain programs installed that Bethesda considers enabling piracy

, such as the legal no cd program alcohol.

Or any program that allows unlimited DVD copying (obviously the only reason you would want to copy a protected DVD is for piracy - nobody should need an archive copy of a game after all)
The downloaded versions of the game - D2D and Steam have their own strange problems - and pirated versions

who knows what problems you get with your download. (you inherit whatever problems the uploader had.) Note: We do not support pirated versions or allow them to be supported on TheNexus.