Yeh try system restore. Hopefully it is enabled. When you get to the desktop screen. Press ctrl+alt+delete. Task manager should pop up. Click on File then New Task. Add this %SystemRoot%\system32\restore\rstrui.exe and click okay. System restore should pop up and you will be able to restore to a previous date.
Client had this problem once after windows update and format weren't an option.
Client had this problem once after windows update and format weren't an option.