DanLeeds10

I had this error and resolved it by running FSX.exe in compatibility mode on win8.1, I also needed to do the FSX Appcrash fix by downloading and adding UIAUTOMATIONCORE.dll. Since doing those 2 fixes it's been stable and working perfectly :-)

I've had weeks and weeks of things like this with Windows 8.1. Firstly I wiped the machine, took all the rubbish off manufacturers insist on giving you for "free", this included my AV software as I only connect to the net on that PC for paid downloads so, windows defender will do, I'll sporadically install AVG, scan it and delete AVG at times too. My main crashes were fixed by: Adding FSX to compatibility mode - for win7 I'm sure this is just clicking the FSX icon and changing this in properties, in Win8 & 8.1 i typed compatibility into the search field and followed on screen advice. 8.1 put FSX in Vista compatibility mode. My other crashes were caused by running 2 monitors on a weak graphics card, my PC came with a factory GTX760 1.5gb card, I could only run things on medium high graphics with 2 monitors because it topped out the GPU performance. In the end I've now added a EVGA GTX960 SSC 2gb and it runs so so sweetly it's untrue, the graphics are awesome but, it can still lag occasionally. My budget was £200 and I don't trust 2nd hand GPU's, many schools of thought say FSX isn't that GPU intensive but, if you're running multiple displays it will significantly drain resource - I have a special monitoring package I use for my job, added this to the PC and found the weak spots that way. Final thing for me was FSXappcrash error, for this i followed the UIAutomationcore.dll fix and, FSX hasn't crashed since. I now run all my monitors, on full ultra high settings with no lag and no crashes. I do have an I7 4790 CPU but it's none K, runs at 3.60GHz standard but, can push it to 3.80GHz with the turbo clock setting in the BIOS. Hope this helps, I know how soul destroying the crashes are but, once they're fixed it's so worth it :-)