Which version of Win 7 did you buy, Upgrade version or the full version.
If you purchased the upgrade version, you must (1) have a qualifing operating system (ie XP or vista - Win 7 evaluation copy does not qualify for up grade. (2) for xp and/or win 7 eval you must do a "clean" install.http://www.tomshardware.com/forum/forum2.php?config=tomshardwareus.inc&cat=63&post=1977&page=1&p=1&sondage=0&owntopic=1&trash=0&trash_post=0&print=0&numreponse=0"e_only=0&new=0&nojs=0
With full version, just do a clean install (best method) and reload programs. Don't forget to backup your personal files and data.