PC Pitstop offers free computer help, use our free PC Diagnostics to tuneup your computer. This is a free PC health scan that will check your computer’s performance, security, software, drivers, and more. It will perform the test, and then give you a little survey about the computer you have. Then, it will display the results. While no settings are changed, they give you steps on how to fix them, or offer you to use one of their paid programs to fix it automatically. These tests are safe.