Why can't I free-up space on my Hard Drive?

A pop-up window recently appeared warning me that my hard drive was almost full and, on checking, I found I had less than 2GB (out of 37GB) free space left! This came as a surprise as I had not added any new programmes for ages however I carried out "disc clean-up", removed some large rarely used programmes, purchased and ran "Wincleaner" as well as "Ad-Aware" and "AVG Antispyware" but, to my surprise these actions did not appear to free up any significant space and I am still getting warnings! I tried to "defrag" but was told there was insufficient space to carry out this process (it apparently requires 15% space and I have less than 2%!) On looking at the defrag. analysis it appears that the most space is being taken up by "Contiguous" files (whatever that means!) and very little by "Unmoveable" files. So why can't I free up any space? Any help or suggestions from you experts out there would be gratefully received.

Why can't I free-up space on my Hard Drive?agv

Make sure your recycle bin is empty, move all of your pictures to one folder and get rid of any 'unnecessary' pictures. Go through all of your documents and delete any that are not needed.

If you feel safe enough, go through your add/delete files in your control panel and remove any unnecessary programs ***IF YOU DO NOT KNOW WHAT THE PROGRAM IS...LEAVE IT ALONE!!!****