Windows 7: reboots by itself then lose internet

Hello everyone, I'm new to the forum so if this has been answered to death please excuse me.

This morning I turned on my computer, it ran perfect for about 5 minutes then decided to reboot itself. After it rebooted I lost all internet connections, still had local connections to printer, scannner.
After attempting to reset router and modem three times I finaly did a system restore.
I got back internet connection for about 5 minutes then it rebooted again and again no connection.
System windows 7 ultimate 64, intel based, I7,home built, had never had a problem till today system has been up and running for over a year.
Any help would be greatly appreciated.
Cheers,
Bob S.

do system restore, then immediately boot into safe mode and disable automatic updates. My guess is you are getting pushed a bad driver. I had that happen to me once.

OK, tomoorow morning when I get back to the office. I'll bring laptop just in case