BleepingComputer.com: VISTA Security Permissions for 1 of 4 Users is MESSED UP

I have Vista Home Premium SP2 64BIT and the security permissions for just ONE user is messed up. We have 4 user accounts and for some reason, just ONE of the 4 users cannot access certain shared programs. When I try to reapply permissions to Drive C for everybody, it returns error messages for just that one user. I have also tried replacing all existing inheritable permissions on all decedents with inheritable permissions from this object and it also returns error messages for just the 1 of 4 users. The error messages say access is denied to files like: Zach/manifest.bin, Zach/permdata.box, etc. also I got the error message the ACL structure is invalid.

Microsoft sent me a DVD disk called an In-place Upgrade to repair Windows Vista, but I want to make sure from this forum that this in-place upgrade can fix this specific problem and won't create further problems or delete any of our user settings, programs or files because my computer is running perfectly fine except for the security permissions for just that ONE user. Can someone PLEASE advise if there is a way to reset security permissions for one-user or do I have to use the in-place upgrade disc and could the in-place upgrade delete or further cause more problems to our personal settings/files?

Why not to create new profile and delete corrupted one?

I tried creating a new profile, that 1 profile and all new profiles have security sharing issues/errors, but 3 profiles/user accounts are fine. Could it be VISTA registry line that could be causing it?

Try here: http://www.vistax64.com/vista-security/744...cess-files.html