Invalid windows key

[Slime101]

I have the student offer windows 7 which i am trying to install, i purchased the additional dvd media and am running from that but its saying my product key is invalid!!!

How can this be as its brand spanking new, and i only purchased it last week???

 

[Slime101]

Entered it it douzen times now, pain in the rear!!!

Ive completed the install without the key for now but i cant see it working for long without one.

 

[Slime101]

No, not using office key - i only purchased windows so it can only be a windows key!

I've looked at bits of the thread above, am i missing somthing, i did what i was ment to, inserted the CD and installed the software but it doesnt like the key???