You can check path, by opening a MSDOS prompt and typing PATH (and press return). What you need to look for is directories that appear more than once. This makes sure that everything is found in the proper place and, if by any chance there happens to be more than 1 copy of the file, the correct one should be used.
If it cant be access then either its in use by another process (kill as much as possible and try again) or something is locking that file.

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