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Ok Heres a trick i Learned from my Computer tech Teacher.
What this does is Tells your computer to extend your pc trial version. This is what PC technicians do when they tell you to send in your pc for repairs and charge you which is really a scam for money>

Ok what you do is
Originally posted by another user
Step 1: Click Start, All Programs, Accessories. Right-click Command Prompt and choose Run As Administrator. Enter your administrator password.
Step 2: Type the following command and press Enter:
slmgr -rearm
Note the space after slmgr and the hyphen in front of rearm.
Step 3: Restart Windows 7.
After you restart your computer you should get a notice saying that your windows trial version has been extended. You can keep doing this without having to pay for a full version. The 90 day trial is considered the full version but you only have it for 90 days whenever your trial is over just do the same process over and over as much as you like. Good Luck :y: