Since you're eager for a clean reinstall, I would save externally a Win7 backup image and make your Recovery disks so you have two paths back to the original install.
Sometimes an important piece of software from the manufacturer's Support Downloads webpage like webcam features (not the cam itself) will not work correctly with the clean reinstall so it might take some detective work with google to get it all smoothed out once you get the superior clean reinstall.
When you're ready here is the latest official Win7 installer iSO download with SP1: Win7 Home Premium x64 SP1 English Official ISO download
Burn to DVD or write to flash stick using Windows 7 USB-DVD Download Tool
Then follow these steps based on thousands of clean reinstalls we've helped with here: Clean Reinstall Windows 7 Factory OEM
If your Factory Recovery is run from boot via F10 then it may still run after clean reinstall. If you prefer to keep it as another backup method you can test cueing it up after reinstall to see if it works then delete it and recover the space then if it doesn't.
CCleaner is perhaps the most highly respected little genius app in the entire tech field, used by everyone from grandma to programmers. Some experts here worry about its Registry cleaner but in hundreds of installs representing thousands of uses I've never had a single complaint nor have I seen a documented case of it causing problems. That said, when offered back up the Registry choices before cleanup.