I have a Sony laptop with Windows 7 Premium loaded. It has a 1 Terabyte hard disk. When I go to "Computer" and click on the Properties of the C: drive it tells me that I have only have 2 Gb free on my hard drive. Now this is absolutely impossible. I probably have used a maximum of about 50 Gb. I check my machine for viruses and it is coming up clean using Norton Internet Security 2010. What now? Is there a way to sort all the files on my hard disk in Size Order so I can identify what the largest files are? Any ideas would be much appreciated. Thx.