All defrag does is organize your files and gets rid of blank spaces on your hard drive it shouldnt ever delete anything....actually I will not delete anything. At least Ive never heard that defrag will delete any files...
Defragmenting of your hard drive does the following....
This is a simple explaination of what
this is a new hard drive (where all your files are stored)
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See how there all nice and neat
this is what it looks like after you install stuff, uninstall stuff Save files and just plain work on your computer.
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now there are empty spots on your hard drive...but when you try to open a file your computer is going to search your hard drive for that file..it has to go thru everything to find it...even the dead areas...which in turn can slow down your computer somewhat.
After a Defrag it will be back to new and everything will be organized and will open faster...etc
a few things about defragging your computer....
its going to take some time and you cannot work on the computer while it is defragging....do it overnite
make sure nothing is running...no programs, Chat programs, turn off your screensaver....etc
start it at night turn off the monitor and go to sleep...when you wake up it should be done. Unless its been a while since it has been defragged or you have a huge hard drive then it will take a little longer. expect at least 4-8 hours for it to finish...depending on the computer of course.