You might try running the scan again and when the error pops-up look for a line in the dialog that says something like: "For more information - URL"
Clicking the URL link should take you to the Symantec site and with any luck will have a specific fix for the issue (usually an 'uninstall/clean up/reinstall' procedure).
You can also do this manually, and depending on how much you want to poke around, you can remove all hidden files and folders that are labeled 'Symantec' (usually found in the user account 'Application Data' and 'Local Settings/Application Data' folders. This normally applies to the 'All Users' account, as well your accounts.
Due to the fact that the 'Scheduler Module' is mentioned, and that we are talking about a Symantec product, your best bet will probably be to uninstall the program and reinstall (perhaps doing a free online scan before reinstalling). As long as you do not mess around in the registry, you will not need to re-activate the product.
Symantec writes programs that tend to have a lot of files, where most (if not all) are dependent upon each other to work correctly. This makes working with one or two files (replacing, fixing, etc.) non-productive due to the normally inevitable error messages that will pop-up down the line.
So, to summarize:
If you want to continue using the product you paid for, do the uninstall/clean-up/reinstall bit.