Mike I'm uploading a copy of Win7 right now, will probably take a few hours. I'll also do the drivers and whatnot so you have it all in one package ready to go.
You'll need to make your USB bootable, it's all covered in THIS GUIDE.
Stick to that word for word and you'll be fine. After that, you'll need to create a folder on the USB, call it whatever you want. Copy the drivers in to it. Then once that's done, insert it into your PC and power it up. As soon as it turns on, keep hitting F2 until you enter the BIOS, which will look something like this:
You'll be looking for the word "boot", it'll either be "boot device priority" or "boot order" or something. You need to change it so that USB is the first option, this is just telling your PC that when you power it on, it has to load the USB first which will start the Windows install process.
AND REMEMBER! Don't be afraid. This is the worst that could happen, and you're forcing it to happen. Anything that happens now can be undone so don#t be afraid to have a nose around the BIOS. I know it looks scary and daunting, but you can literally reset everything to defaults with one single button. Gone are the days when you could fry PC components with a BIOS, it's all idiot proof now