For the 1st it's a Lexmark exe file, so if you're registered they're just logging onto you via their cookie.
I can't help for the 2nd.
The 3rd is a registration issue in your HOTKEYS, which when the file/s are deleted should help:
RUN/ type regedit, explore LOCAL MACHINE_Software
_Symantec_ (and probably DJSUserData). But if you haven't been in registry before make a backup just in case.