Cannot click on desktop

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I cant use my virus software or anything and ive tried downloading stuff to fix it but I can download but cannot actually save it to run it so im at a loss as to what to do next ive been trying to fix this now since yesterday and im not real computer savy so I didnt want to do something that could hurt it either.

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also I cannot open any of my programs in my start menu they all say windows cannot open this file.so therefore I cannot even do a system restore.

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Im stuck if anyone can help me PLEASE!! everything was fine yesterday I logged off and when I went to log on again all my desktop icons had the IE logo instead of the normal icon pics and when I try to open them it just opens an internet explorer page then that disappears and a download window opens but when I try to click download it disappears and the IE page opens again it just repeats that process every time.