So I was updating a system with some new memory and discovered that I still had the Microsoft Indexing service running on it. I use this older system for FS9 and don't really want the indexing service tying up memory when it could be going to the sim. (By the way, if anyone knows of a valid reason to keep it enabled or if FS9 even uses it then do tell)Anyway, I disabled the indexing service via the services.msc app and went ahead and disabled it on all of the drives in the system. There is a file attribute which XP clears on each individual file when turning off indexing on a drive so it does hit each individual file. Low and behold as XP was changing the file attributes on the drive that FS9 is on, it found a bunch or files which were corrupted and needed to either be recovered or removed.So I went ahead and ran chkdsk and it gave me a list of files that needed to have this done. I first made a copy of the list and then ran chkdsk/f which fixed or deleted the file errors. I then replaced the fixed or deleted files with copies of the originals, just to make sure that they were valid and usable. There weren't that many so it didn't take to long. The interesting thing is that some of the corrupted files appeared in places where either I noted a CTD or had issues with the sim's performance.So the short of it is...run chkdsk periodically to make sure that you don't have any corrupted or unreadable files and folders on your system because they might be causing CTDs. Hope that helps :)Mark

Hi,Swoop and all. And NOW, don't forget to DEFRAGment. . .! B-)Blue skies.

Excellent tip. I recently found a bunch of MRAI afcad files that were corrupt - couldn't even read properties in XP. Unfotunately I just deleted them without noting down their names so not sure if the download was corrupt or happened later (but seemed to be in same "batch"), so anyone having probs would be wise to check files starting MRAI_.... Often thought it would be a good idea to compile a list of known faulty files (I'm just too lazy too do it!)Daveps Not intended to knock the very good MRAI team!