The fastest computer diagnosis

Quickly checks your computer for the most common problems. It's free, fast and easy to use, anonymous and safe.

By running the scan you agree to these conditions.

Most common problems

The components, operating system, security, hardware, drivers, software and processes are checked and advice is given about safety, capacity, updates, unusual behavior, etc.

Anonymous & safe

No personal details are retrieved and there are no checks for illegal software. The scan program only performs checks and does not make any changes to your computer.

Free, fast & easy to use

Running a scan is free, a matter of seconds and extremely easy to use. The scan program does not need to be installed and the results are clearly explained ordered by importance.

Optional registration

If you subscribe your device, then we can send you warnings that are determined after the scan and periodic information about the versions on your device and we will save your scans for you.

Frequently Asked Questions

Question: When trying to start the scan program, I get one of the following error messages:

  • Microsoft .NET Framework version 2.0 is required ...
  • The Application failed to initialize properly (0xc0000135)
  • Unable to find a version of the runtime to run this application
  • Cannot find a required DLL file, MSCOREE.DLL

Answer: In that case you should download and install the Microsoft .NET Framework version 2.0.

Question: I get the message 'Cannot start the application' or 'Startup failed'.

Answer: In this case the ScanCircle application may have been installed erroneously on your computer and can be removed using the Control Panel. Or you can run the following command to clear the so-called Click Once cache (Windows key + R, no output shown): rundll32 %windir%system32dfshim.dll,CleanOnlineAppCache

Question: At the start of the scan program a 'Microsoft .NET Security Warning' balloon is shown.

Answer: Download the scan program (in Internet Explorer/Edge, use the alternative scan option), save it to disk first and then run/open it.

Question: The scan program is interrupted/cancelled.

Answer: Some anti-virus/spyware programs check the reputation of downloaded programs. When a new version of the scan program has just been released, this check may fail and the scan program is interrupted or canceled. If possible tell you anti-virus/spyware program that it is okay to continue the scan program or indicate that it may be started normally next time. Alternatively you can download the scan program (in Internet Explorer/Edge, use the alternative scan option), save it to disk first and then run/open it.

Question: Why do I get a firewall warning?

Answer: The scan program needs access to the Internet to upload the scan data. If this fails, you can save the scan file locally (e.g. on the desktop) and do a manual upload of the scan file on the web site.

Question: I get another error message or have question about the scan program.

Answer: Please provide us with the message using the contact form together with any relevant details of your device (operating system version, web browser used and the steps you have taken).