Just run Norton Windoctor Version6 and its come up with this problem which it can't fix. I've never seen it before. The details are >> missing file C

WINDOWS\system32\rts.exe" cannot access a necessary file, "sbpack32.dll <<
Run Adaware 6, Spybot S&D, McAfee Anti-Virus, no problems.
Computer seems to be running happily enough, I'm just curious as to what it is and if I can safely ignore it. Symantec's site was no help or Google.
Computer's using Athlon XP2000, Windows XP Home (fully updated), Groaning under the weight of software installed.