Yesterday, I downloaded a free update for McAfee security centre, and since
then I can't print anything through iprint. I just get the message
"submission failed" if I check the document status. I am using a PC, with
Windows XP.

I have tried:
1) turning off Windows firewall in case it was conflicting with the McAfee one
2) checking program permissions in the firewall settings....NPDS RPM &
Notification Listener is allowed full access (if that makes a difference)
3) reinstalling iprint and putting the printer drivers back on
4) using system restore to revert to a time before the McAfee update - but
the system would not restore!

None of the above made any difference. Please help!