HELP! Flight Simulator X Deluxe Won't Uninstall

For Christmas this year I was given a new PC. I have decided to transfer my
copy of Flight Simulator X Deluxe from my old PC to my new one. I was going
to uninstall it from my old computer but in the Microsoft Games\Flight
Simulator X folder I can see all of the program files but not the uninstall
file. I then checked in the Add or Remove Programs list but Flight Simulator
X is not listed under M or F. I have installed it in my E:\Flight Simulator X
Files\ folder and when I checked in there there was no sign of an uninstall
program. I can still play the game perfectly but I can't get rid of it. I
have software that can remove the files but if I do this then it won't be
thought of as 'un-activated' and I won't be able to install it on my new
computer. My new computer has Windows Vista and my old one uses Windows XP if
it's of any relevance. Please help me!