WINDOWS RESTARTS AUTOMATICALLY...

Possible Reasons:

This issue could be caused by any of possibilities mentioned below.
- Software/Application trouble
- Hardware issue like Heat related issue.
- Computer virus attack.
- Operating system major file damage - dll, exe
or other system files.

Solution:

- On desktop right-click on My Computer.
- Click on Properties option.
- In System Properties window click the Advanced
tab.
- In Advanced click the Settings button under
Startup and Recovery.
- In the Startup and Recovery window uncheck the
Automatically restart check box.
- Click Ok.

Then check your system, still problem exists, need to re-install OS and Apps again..