The problem: Can't save Microsoft Word 2010 documents due to file permission error , it shows following massage:
"Word cannot complete the save due to a file permission error"
User Derek1110 wrote:
"SOLUTION: Change the format of your portable USB / thumb drive to NTFS from either FAT or FAT32 which it may currently be.
Solved all my "file permission error" issues"
Derek1110 was right , I had a thumb drive connected as a Ready-boost , after formatting it to NTFS the permition error went away
Thank you Derek1110