Computer reboots on startup constantly

So, this problem has been happening for a while now, I've ignored it but now it's bothersome.

So my computer starts out logging on, sometimes it'll take a long time on the splash screen, sometimes it'll freeze on the splash screen, but now more recently, it's just gotten to the splash screen, not turned off, and restarted itself back to the start screen. It comes up with the problem of Windows not shutting down properly and asks for system repair or normal startup, but system repair doesn't help at all because it gets to the background screen and system repair doesn't pop up. This is bothersome, obviously. It hasn't turned on since. This has been happening for the first time just today.

Do you have a system repair disc? System Repair Disc - Create

You do not need to create it on your system. You can do so on any 64bit Windows 7 system, even if it is not Home Premium.

Thanks for the help. I've burnt the disc and I'm gonna try it soon.

No good. It tells me system repair needs to be logged on to go any further and then it tells me to contact the system admin. Anything to help this?

I am not familiar with that problem. Did you boot from the repair disc, or are you trying to run it within Windows?

Troubleshooting Windows 7 Failure to Boot