MS in their infinite wisdom, provided us with a
Go Back program, years ago.
Today, it's called "
System Restore" and it's in the '
Programs > Accessories > System Tools folder.
Unless someone has turned it off, there will be a restore point in there, maybe a few days old, that you can use to GO BACK to a time before you GOOFED.
I use mine so often that I run a little script in my Startup folder to force a new Restore Point every time I boot up my PC.
I can think of few things that are worse than needing to GO BACK and not having a Restore Point to go back to.
Good Luck,
The Shadow