yes i checked these things and the antivirus seemed to work well, it is a few months ago i'v defragment, but i first wanted to clean up all my documents first (got an external hard drive, but it's a lot of work) and so i came to notice that there were several Gb not mentioned in the maps and i wondered why, it seems a lot (so many ghosts ?)
[also bad sectors and registry files can do this too (make space hogs) its best to get a scanning program to fix the registry.]
i do not know what these are (space hogs, a scanning program to fix the registry),
i once had to erase a few registry entries (some kind of nmbb or something and there was no other way than manualy removing it, it worked out well, i carefully followed the instructions, but a friend of mine told me i shouldn't do that kind of things)
aren't there any good websites about how to maintain your computer healthy ?