It would all depend on which one you installed. You might be able to look at your System Partition Root Folder (usually C:\) and look for the loader then delete it. That's EXACTLY why I NEVER recommend using those Pre-Activated Versions of Win 7 floating around. At least if you use a loader that you install you can usually just run it again and choose to un-install it.
It's working .... Great minds think alike Used Acronis to create backup of Vista partition onto external USB drive. Used W7 to delete all partitions and install fresh. After install, SLIC toolkit STILL reported DELL as per 1st post. Reflash BIOS using Winflash /force. SLIC toolkit now reports TOSHIBA (see attachment) Used cert you provided. Used OPA tool to insall key. W7 Ulitmate installed and running fine. Now restoring Vista. Very interesting. I can only assume that there was "something" inplace that was preventing the BIOS flash from overwriting the BIOS. I owe you 1 x Pint