Reinstalling Windows 7 on a computer with preinstalled Windows 7

Hey ya'll, I'm hoping somebody can help me out or point me in the direction of an answer.

My computer started having a few odd sign-in errors for the different accounts then one day we tried to get on and all the accounts had an error and it said to contact system administrator. So I signed in as an administrator and there were all sorts of issues. Norton wasn't working, certain programs wouldn't open, sound wasn't working, aero wasn't displaying sometimes etc. I ran norton power eraser as suggested by norton and it found registry errors. It attempted to repair these errors but after restart it failed to boot properly and I got a black screen with just the movable mouse. After waiting a few minutes it got to the login screen, then a few more minutes and the administrator profile loaded. But it's been downhill since.. I had to uninstall norton as it kept crashing, when I try to run in safe mode it starts loading the drivers then breaks and restarts in continuous loops.

I'd like to just wipe this install of Windows 7 and start fresh as I'm pretty sure it's registry/driver errors causing all the issues(correct me if I'm wrong, please). Here's my conundrum, there is no partition on the hard drive for a reinstall and I've never installed an OS on a system via USB with a UEFI control on boot up, is there anything I need to do different? My knowledge of computers isn't advanced, but it's above rudimentary.

I've run Belarc Advisor and have my windows 7 product key (although no luck finding Office 2010). I also have an image of Windows 7 although I'm not 100% sure it's the proper format etc.

Any help would be greatly appreciated. Thanks for your time.

I would Check the hard drive with the manufacturer's diagnostic tools first.
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
Hard Drive Diagnostic Procedure

To clean install:
1) Clean the HD Drive, using Step one in this tutorial:
SSD / HDD : Optimize for Windows Reinstallation
than
2a) clean install with the OEM manufacturer's Recovery Disk.
2b) Clean Install Windows 7
2c) UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with

Hey man, good call on the hard drive check. It failed. I'm going to try to do a drive repair, but if that fails then I guess I'll be looking for a new hard drive. I was having motherboard issues last year, could this cause a hard drive to go out?

The Recovery disks reinstall all the factory crapware and useless duplicate utilities that interfere with better versions built into Win7. I would do a Clean Reinstall from the link in my signature pic below.