I need to get detailed instructions how to completely remove Tor browser from Windows 7.
Yes, it is that simple - if you need the space - just delete the folder.
The Tor Browser is self contained. All its disk activity is contained inside its folder.
Your Firefox profile and settings are not affected by the fact that you downloaded or are running the Tor Browser. It doesn't make any changes to your operating system and by default it doesn't store anything about what you did while using it.
When you start the Tor Browser, it is the only program that is routed through the Tor network. You can use it alongside Firefox, the web sites that you visit through Firefox wont be routed through Tor.
If you need to route another program through the Tor network, while using the Tor Browser, you must manually configure it to use the socks proxy running on port 9150 on 127.0.0.1
When in doubt, you can check if you are routed through Tor by visiting https://check.torproject.org/
Be aware, that when you delete files, they leave traces on your disk. That means, that even after you delete the folder, a forensic investigation could find that you at one time had downloaded the Tor Browser, but not how you used it. In contrast, it should find almost everything that you used your standard browser for, even in private mode.
One way to counteract that, is to keep the Tor Browser on an usb drive.
Also, at minimum try using full disk encryption.
A better approach will be to use Tails on that usb drive.
It's not useless information just incomplete. Some files are locked because "They are in use by another program" You also need to go to task manager ctrl alt Del keys simultaneously - choose "Start Task Manager" go to "Processes" scroll down to find the "tor.exe" process and "stop the process. You should then be able to delete all the tor files.