I do not know how you can find out which games require those two files as I do not run any games on my PC.
Removing drivers is often possible by uninstalling them as you would uninstall an application using Control Panel > Programs & Features, so have a look in there. The filenames themselves will not be listed there, but will probably be part of a "package" with a different name. Uninstalling that package also removes those two sys files.
Failing that, just delete those two files (use search tool to find them).