My computer, which is running Windows 7 64-Bit, restarts on boot up

[F86Sabre]

Hi, I just built my first computer on Saturday. Whenever I start up my computer, it will shut down and restart. Also, when it finally gets to the desktop, there is no internet access.

To get internet access, I have to restart my computer.

Here is a video: http://www.youtube.com/watch?v=C45mzhVDcxU

I was wondering, what would be the easiest way to fix this?

 

[Route44]

Tell us about your system: hardware and security, etc. What is the make of your power supply? Did it come with the case?

 

[F86Sabre]

Tell us about your system: hardware and security, etc. What is the make of your power supply? Did it come with the case?

I have:

Kingston 4 GB of DDR3 RAM
1 TB Hard drive (Seagate?)
Corsair 650 Watt
EVGA GTX 560ti
Intel i5 2500k
Asus P8P67 LE MoBo
Cooler Master Case

Microsoft Security Essentials
Malwarebytes Anti Malware.

No the PSU did not come with the case.