I installed Windows 7 Ult 64 bit trough Windows XP, but I installed on my non primary HDD to back up files. Once the files were copied to the new HDD I re-formatted my HDD. I have an issue with My Computer recording the space usage. It says I have used 553.GB of my 111GB Drive But when I select all my folders (hidden and not) the total is 35.6GB I also got this number totaling each folder separate. So my question is where is the 19.6GB my computer is not accounting for? If I can't find a solution I might reinstall formatting both HDD's. Thanks for your help.