Computer stuck in endless boot loop

[jdtdwp]

Today I tried to boot in safe mode using the normal F8 when restarting and that didnt work. So I tried looking for other methods of booting into safe mode and came across the method of msconfig change. I typed in "bcdedit /set {default} safeboot minimal" into the command prompt realizing that it would boot into safe mode every time I restart unless I changed it back.
Once I did this and restarted the computer, it goes through the normal safe mode boot screen and then into the welcome screen. As I type in my password, the computer shuts down and reboots. It doesnt give me any options to boot in a different mode and pressing F8 doesnt return any results either. Now I'm stuck in an endless reboot loop and can't change BIOS settings to try to boot from a repair disk.
Any ideas what to try next? Thanks.

 

[jdtdwp]

Tried restarting again and somehow I was able to get into advanced boot options this time and repair my computer. I clicked command prompt and entered in: bcdedit /deletevalue {default} safeboot. Now my computer restarts normally and did a start up repair and now I'm logged into my computer.
But I still cannot boot into safe mode at all. I'm not sure if it's the result of a virus. I ran Norton Antivirus full scan nothing came up. I also ran Malwarebytes which returned no results.

 

[Jacee]

Sounds like you may be infected, but Mbam and Norton may not be picking up the infection.
You may need to follow Greg's tutorial: http://www.sevenforums.com/tutorials/219533-troubleshooting-windows-7-failure-boot.html