This simple fix.
Start the computer in safe mode… not safe mode with networking – networking will not allow you to log on due to not being activated but plain safe mode will.
Click start, run in the run command line type this in exactly
Note the comma and capitalization have to be included.
This will give you a new 30 day activation grace period.
Now restart the computer start windows normally.
Now you are able to uses windows but it still will not activate. To fix this you must download IE8.
Note IE7 will work but you might as well go ahead and update all the way to IE8 to make sure there are no further issues.
Once IE8 is installed you will be able to activate windows as normal.
If for some reason you do not see the activation icon – it is located Start-all programs-accessories-system tools
If you do not see it there type this into the run command
See this link for full explanation http://www.computersandmore-tx.com/blog.php?post=3
hope it helps,