I tried this free Microsoft cleanup tool to see if it'd speed up my Windows PC - here's the result

To grab PC Manager, head to its dedicated product page or go directly to its Microsoft Store page. After installation, open the program. If you wish, you can set it to start up automatically each time ...
How-To Geek on MSN

Windows Sandbox is the safest way to test unknown files without risking your PC

Run untrusted installers in a disposable Windows desktop. Add a simple config to lock it down, then close it to erase everything.