1. Close all running applications by opening the Windows Task Manager. To launch Task Manager, click 'Start,' 'Run,' type 'taskmgr' and press 'Enter.' You can also use the following shortcuts: 'Ctrl-Alt-Delete' or 'Ctrl-Shift-Esc.' Select the application that is giving you the runtime errors and click 'End Process.'
2. Check for bug fixes, patches and upgrades. You can also search on the web for the specific runtime error that occurred.

3. Perform the following steps If a debug option occurs along with the runtime error: In Internet Explorer, click 'Tools' from the top menu and then select 'Internet Options.' Click the 'Advanced' tab and select 'Disable Script debugging.' Close and then restart your browser.
4. Run an antivirus program. Viruses and spyware are one of the most common culprits of a malfunctioning computer. An antivirus will kill any detected virus or spyware and may fix runtime errors.