Typically, you'd be able to see such "Execution Engine Errors" in Windows Event Viewer application. And, take it easy. As you can see, most of 'em could be trouble-free. At some point, such (endless) "errors" could happen everyday even every second.
Here are some solutions you can refer to fix Execution Engine Errors
- For Windows XP (SP2 / SP3) users: Save or move your sensitive or personal stuff, switch (uninstall) your old XP system (Google for related guides) and use other newer OS from Microsoft such as Windows 7 (64-bit) Pro/ Ultimate (Use original install disc or other sources). This is highly recommended, for security reason, mainly.
- Because most of these Execution Engine Error could be FrameWork (aka, "Microsoft .Net Framework") application related, please follow this routine exactly: first try repairing > uninstall (via Windows' own uninstall utility) > reinstall using the Admin account.
- Employ your active Live or other Microsoft-related account, download this official "Fix Tool" to permanently repair Execution Engine Errors.
(P.S.: It seems that the source had been moved or removed, permanently, according to some comments @ Blog-Mstechnology. And, if you too have no luck w/ that link, give this one a try later.)