A short cut on your desktop will have a small arrow in the bottom left hand corner of the picture.
I am not sure how everything gets installed twice. That is strange.
Which, o/s are you using, if your using XP just do a system restore.
Also check your hard drive and look in the programs directory to actually see if you have two lots of files installed.
Also check you Add/remove programs from the control panel and see what programs it thinks you have installed on your pc.