I got Windows 7 x64 for free off of MSDNAA through my school. I want to install on my PC, but my PC also functions as my HD DVD and Bluray player. I am using Cyberlink PowerDVD 7 Ultra to play these on Windows Vista x64 right now and it works like charm. Will I run into issues with trying to install or use the program on Windows 7 x64? Otherwise I won't bother installing the new OS.