Sometimes Windows permissions get messed up such that even an admin cannot access the file. The process for fixing this through the UI is very slow going, so here is a script to set the owner to Administrator then give the Administrator full permissions to said files.

setowner.bat

:: Fix ownership on a directory
:: Download subinacl (if needed) at http://www.microsoft.com/en-us/download/details.aspx?id=23510

C:\subinacl /file *.* /setowner=COMPUTER\Administrator
cacls *.* /G Administrator:F