Can I install Windows 7 Home Prem on another PC if I uprgeaded mine?

I think that depends on whether you bought a full Win7Pro upgrade or one of those Any Time Upgrades that upgrades an existing Win7 installation to a higher one.

Well...

Through the microsoft academic alliance I bought a download of Win7 Pro (I'm a student at the mo), but I used the license key for one of those anytime update things. I suspect the answer to my original question will be no as a result...

Use window 7 operating system rather then window xp because it will give well and good out put then window xp.There are also some additional functionality are added in it.overall system is friendlily and output of each functions are better then window xp.

Umm, I'm not using Windows XP. Look at my original post!