Originally posted by ZeroFreak
I had same problem until I asked my computer teacher whats happening. Its not a virus or anything so dont worry. Its just that your license is either expired or your liscense isnt activated. You can try this
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.
What this does is turn your Trial version into a 90 day trial you can do this after every 90 days but i think it only works 3 times. Well thats enough time to get a new Operating System of your choice. But Good Luck