restore messed up permissions

[My1]

as the permissions get really tricky when using the NFS server I have a script to do them which should be executed by the task scheduler, problem is, that it didnt execute the script at its place but seemingly in some windows folder, and therefore it messed up my permissions.

 

does someone know how I can reset them more or less easily without reinstalling the whole system?

 

already tried an inplace upgrade from 2008r2 to 2008r2 but it says that the installed system is newer than the system to be installed...