Consistently does not open, gives the error: "C:\Program Files (x86)\Mozilla\firefox.exe Windows cannot access the specified device, path, or file. You may no

Installed FF 16, 17, 18. Will not open in normal administrator login, nor with "Run as administrator" but will in W7 safe mode. Changed permissions (had to do it in W7 Safe Mode, normal login would not allow (logged in as an administrator) could not delete the Mozilla files in normal login. On rare occasions, with a new install, I could get it to open once, then not again. Searched the reg for any mention of Mozilla or FF and cleaned it. Tried FF safe mode, no luck. Checked permissions after taking ownership and propagating full ownership rights to all FF files, many reboots, no luck. Chrome, IE and SeaMonkey work fine. Using a fairly new install of W7 Professional 64 bit, on a Dell Optiplex 990 i7, 16GB ram. Had the same problem with another user on an identical box. No problem on other computers No other program problems.

I should have been a bit more definitive.
I have uninstalled FF, with the windows uninstaller, by manually cleaning the files and the registry of any mention of FF or Mozilla, and by running Revo uninstaller - always rebooting and checking to see if the files are indeed gone. (I have set windows file preferences to see all files, including system files.) I have run 4 AV/malware scanners and found nothing but a few tracking cookies. I download, from Mozilla.org, (http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/18.0/win32/en-US/Firefox%20Setup%2018.0.exe) a fresh copy of the Firefox Setup 18.0.exe each time and install when logged in as an administrator and choose "Run as Administrator". I get the same result each time I try to open Firefox. Consistently does not open, gives the error: "C:\Program Files (x86)\Mozilla\firefox.exe Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." This happens even when I run the .exe file from the x86 program directory. I have also attempted to run in XPsp3 compatibility mode to no avail,
I make the following assumptions:
The system is not infected
I am doing clean installs
There is no existing trace of FF on the system
I get identical results on one other W7 64 bit Optiplex 990 system with an i7 processor and 16 GB or ram.
I CAN run in windows safe mode with networking.
I have no other software or hardware issues.

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