>Remove your hard disk from your PC
Watch this tutorial of you don't know how to (http://www.youtube.com/watch?v=XUveWh-Qgqg)
Note: If your PC is a branded one (HP, DELL etc) then doing so will void your warranty
>After safely removing the hard disk, connect it to another desktop PC either internally or using a dock
>Turn the PC on which you just inserted the Hard disk
>Goto "My Computer"
>Right click the drive you inserted and then click properties and un tick "Compress drive to save disk space"
>Turn the PC off
>Remove hard disk and insert into your PC
It should boot normally
Reply if this solves the issue or if you encounter any other problems