Help.. Norton Keeps Shutting PC Down/ Will not let boot up

Hi All,

Really hoping some one can help me here.

 

I have recently brought Norton Internet security 2010 and installed it on my Pc, All went well, activated, and updated,

 

After i restarted my Pc, i get to the windows logo and then my computer shuts down.

I have run startup Repair, and that didnt work. So i scrubbed my System thinking i could have had a virus in there before i installed NIS, But unfortunatley the same happened again, then i scrubbed my Pc again, installed again, restarted, and then again it shutdown while windows was loading...

 

I scrubbed pc yet again and installed all my programs, and not installed NIS, and all is well, restarts no problems at all,

 

Can anyone please advise me on what the problem could be,

 

Im Running

 

Windows 7 Ultimate ( official version not pirated s**t)

PC- Packard Bell  LJ61

CPU Temp  average 75 degrees C

Reg Cure

Advanced System Optimizer

Spyware Scan-- Nothing at all detected.

 

I have had computer back off and cleared fan, before writing this and before i tried to reinstall norton

 

Before i tried norton, i had Avast on board and didnt have a problem...

 

PLEASE HELP

Regards

 

Rob