This tutorial assumes you can boot into Windows 7, but what if you can't?
My system was all set up and running perfectly (better than it ever did XP).
Then I decided to try out WarCraft 3 again. It installed and played fine, but when I exited the program, all Aero features were disabled and the options to turn them back on in Control Panel were greyed out. So I tried to restart, but while shutting down I got the BSOD and now the system will no longer boot.
I tried system restore, to no effect. Then I tried the start up repair, but that only managed to make things worse (I can now no longer access the repair options during the boot process).
System Manufacturer/Model Number PC MUTT OS Windows 7 RC1 CPU AMD Athlon 64 X2 Dual Core 4200+ Motherboard ASRock 939Dual SATA-2 Memory 2GB OCZ DDR PC3200 Graphics Card NVidia GeForce 8600 GT 256MB Sound Card Creative Sound Blaster Audigy Gamer Monitor(s) Displays LG Flatron W2242T 22-inch LCD widescreen Screen Resolution 1600 x 1050
Keyboard Logitech Wireless Wave Mouse Logitech Wireless Wave Hard Drives 80GB IDE Seagate HDD -- Windows 7
80GB IDE Western Digital HDD -- Windows XP SP3
500GB Western Digital external HDD x2 Internet Speed High-speed cable
Other than from the watermark, you can see what build number you have in About Windows.
See if you can run the repair install now that you ran the SFC /SCANNOW command. Those watermark removers can cause problems like this that usually end up in a clean reinstall to fix.