Once the registry clean is on your computer and has found certain specific errors and gives the option to remove or clean an item–how am I to determine which item may be removed without damaging the way the computer runs. my registr scan says I have over 1200 problems! It gives the option to remove any or all of them, but warns that removing them can cause disfunction of my normal wanted programs. Should registry clean only be done by a professional? And how much would that cost?