Probem with FS9 Slew mode.

Hi All,Two weeks ago I bought a new PC in an effort to gain better performance (required to run Flight Simulator satisfactorily).All OK, it took me 15 days to setup my new system and to add all add-ons to FS, except a strange malfunction in FS9 : After return to normal mode from slew mode (Y), my a/c all engines fail and shut down. I hope that someone has dealt with such a strange problem in the past and lets me know if there is any workaround on this, apart from reinstalling FS9 once more with all of its numerous add-ons.Please note that this doesn't happen in FS8.My system :Intel Pentium IV 3.2 GHzATI-Radeon (MSI) X850 XT PlatinumRAM 1024 mb DDR2Mainboard MSI 945PNorton Internet Security 2005AD-aware 1.06Spybot 1.4CH Yoke & Pedals.Thanks for your time,Sotiris.