Finished reading.
The upgrade version of windows 7 installs the same way that Vista did.
Install with no product key as a full retail install from the upgrade disk
then go back and do an upgrade over the trial install this time using your product key.
Personally, I am not a fan of "upgrade installs" so I always do fresh...
MAke sure you have X64 version of 7. My personal feelings on the OS are not favorable, but I do run it. I am a software and hardware junkie and always want the latest. My 24/7 rig though is still running Vista x64 though and going strong after all this time

(It has been so long since a format reinstall for me I honestly have no clue how long ago I installed it LOL, a year maybe?, compared to quarterly XP installs... its a great OS)
7 should be even better than Vista once I get over all the stuff they broke in it.