using FS2002Some wierd behavior since I upgraded operating systems to XP, I kept the old HDD and am using FS off it. Before PMDG 737-700 would track the magenta line like a champ, now however it slips a good 5 to 10 miles off track (usually south or west of track) and seems incapable of following the line, even after going into heading mode to put it on an itercept heading and reingaging V-nav on the line, it will go back the way it came untill it sits offtrack again at 5 to 10 miles southwest. I reinstalled the service pack 1.3 again and the only change was that now when I go to overhead (shift 7) and come back the main panel's PFD and other screens have frozen and won't move till I remove main panel and bring it back (shift 2). Driving me nuts.

I have had XP for 2 years now and nothing like this has ever happened to me...I have flown off track while flying in FS2002 because of an AFCAD2 BGL in the KSAN scenery by flytampa but also my approach was this much off...Boaz...

Regarding the screen freezing, it is essential with the 737 that you use the panel icons on the screen, or use the PMDG key mapping feature to assign keys to change the views.If you start using shift # you will get this freezing problem.