Registry file error, a0001748.dll, is related to Microsoft Update Custom Component Locator. The custom component allows new updates and add-ons of Microsoft features. It also enables users to customize functions in the operating system.

If you find a0001748.dll error, something could have been corrupted, misplaced, or damaged when you were updating your operating system. Microsoft is not known for carrying security threats associated with viruses or Trojans, but other harmful malware may try to corrupt these files to get past your security settings.

Consider running a regular registry cleaner scan to see if any of your registry errors are a threat to your operating system.