Start Menu Items occasionally dissapearing

I have read through the previous solutions to this problem and does not stop
it from happening. I have all games, programs sorted into diffrent folders so
it is easy to find. Since about 3 weeks ago, these items reset themselves and
dissapear totally. I have twice collected shortcuts from my programs and
organised them again in the start menu and now they have all dissapeared
again. Everything in the recently used section is up to date, just not the
programs section. I have tried the regedit and it was already there and ok
anyways. I even have an old uninstalled game folder in the programs menu
which i can not delete. Right clicking on it does not bring up any option
other then to collapse it. Some recently installed programs like my new ATI
Video card accessories are still on the menu. I am very confused and
hopefully can get an answer to it. as i am tired of finding all my installed
programs and creating shortcuts and organsing them yet again in my start menu