Duplicate icons on desktop

I am having problems with all the icons on my desktop appearing twice,
i have looked for some way to solve this on the internet but without
any success so far. I belive the problem was caused by moving entrys
around in my start > programs menu to stop it taking up so much space,
i have had this make things in the startup folder start twice before. i
have tried deleting and replacing all my icons, but it just makes
duplicates of them after refreshing.

Any help with this problem would be greatly appreciated, its very