I happen to delete mine before I read the other info, so I went online to McAfee.com to find the solution, and it worked.
This is what they said:
In the event that SULFNBK.EXE was deleted erroneously, the following method may be used to restore the file from backup:
-- Windows 98 Instructions --
1) Click START - RUN, type SFC and hit ENTER
2) In the "Specify the system file you would like to restore" field, type C:\WINDOWS\COMMAND\SULFNBK.EXE and hit ENTER
3) In the RESTORE FROM field, type in the path to your WINDOWS CAB files
(ie. C:\WINDOWS\OPTIONS\CABS)
(ie. D:\WIN98 where D is the drive letter assigned to your CD-ROM)
4) Click OK and continue with the restore function
-- End Windows 98 Instructions --
-- Windows ME Instructions --
1) Click START - RUN, type MSCONFIG and hit ENTER
2) Click the Extract Files button
3) In the "Specify the system file you would like to restore" field, type C:\WINDOWS\COMMAND\SULFNBK.EXE and hit ENTER
4) In the RESTORE FROM field, type in the path to your WINDOWS CAB files
(ie. C:\WINDOWS\OPTIONS\INSTALL)
5) Click OK and continue with the restore function
-- End Windows ME Instructions -
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