Just DO NOT install it in c:/Program Files. Windows protects that directory.
C:/Program Files (X86) works OK, but I (and others here) feel it is wiser to make a whole new directory. For example, I used c:/Games. I have multiple copies of SH3 here.
After you do the initial clean install of SH3, do not run or modify it.
COPY that original install as many times as you want to different sub-directories. Use one of these COPIES for playing vanilla SH3 or for modding, as in adding GWX Gold and the like. That way, if you're forced to delete a modded version for some reason, you still have a clean version safely protected from which you can make a new copy.
You will need a copy of MULTISH3 to set up the saved games subdirectory in My Documents.
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Raptor
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