Right click the install.exe and select "Run as administrator"...
That's the way to install programs that assume that the user is the administrator which virtually every program made for XP or earlier does.
It's a lot more than access to the programs folder, there are reg entries and files put into system32 and other other now restricted places. Merely changing the program name will not get it to do any of that, only running as administrator as you would have done by default on XP will ensure it to work.