If Windows 7 came preinstalled and you wish to run Factory Recovery then post back the computer maker and we will give you the steps. You can also find them online on the maker's Support Downloads webpage for your model, or by googling how to run Recovery for your brand PC.
If you have retail Windows 7 then unless you have a
System Restore point remaining from the time of setup, you needed to save a Windows 7 backup image to restore at times like these:
Backup Complete Computer - Create an Image Backup.
If you have neither option then if you'll post back the problems you're experiencing we might be able to help you resolve them, or you can go ahead and back up your data to
Clean Reinstall - Factory OEM Windows 7 - the steps are the same for retail.