The easiest solution I found was as follows
"Hello, I had the same problem with my win7 32bit. But i have a solution that is very simple.
- Press ctrl+alt+delete (all three at the same time.) Wait for a screen to appear with the options lock, log off, change password.
- Select start task manager.
- Click on new task...
- A new window should appear. There should be a text box next to open. In the text box should be cmd. If it is not there, then type cmd. Then click okay.
- Now windows/systemXX/cmd.exe window should be open. Please type shutdown/r .
A notification should appear saying windows will shutdown in less than a minuet. After it shutsdown it will restart automaticlly. Log on and windows should start."
Credit - tara payn3 from tomshardware forum