if you have opened processmonitor or a similar app during your windows session, that would trigger apps that dont like 'debuggers' to send that message until you restart
also possible for some antivirus to trigger that too
freelancer must have some kind of anti cracker/anti trainer (cheat) protection
i'd say get omega 7.12 drivers for that card if you're sticking with games before TF2 or UT3 or ETQW (i have an x800 that runs on omega7.12)
(Radeon Omega Drivers 4.8.442)
this is in XP 32bit?