how many times can i install the program with 1 serial? my situation now is that i'm using windows 2000 on a partition of the system disk. i want to wipe the partition and install a clean copy of xp on it. later i will wipe the partition again and install vista. i want to install TI on all of the OS's to make backups of the partition so i can revert to a different OS when i want to. will this be a problem?