Auto Protect Failure

I have NIS 2005 and I am unable to turn on Auto Protect. Each time I try to turn on Auto Protect I get the error message "internal program error 4002,517". I have tried reinstalling both Windows XP Pro SP3 and NIS. When I reinstall NIS it initially works correctly, but as soon as I use autoupdate or try the update file 20120208-004-x86.exe or 20120208-004-i32.exe the Auto Protect will not turn on. The update files state that they work with NIS/NAV 2005 but clearly there is a problem with the update. I had a similar problem about 18 months ago which was eventually resolved by Symantec. Any ideas on how to resolve this new error. Thank you.