"When you uninstalled FS2K4, did you shut down your system and restart? (this usually cleans up the registry). Then goto the FS2K4 directory and delete anything left over from the uninstall? Then deleted all remnants of FS9.cfg (do a search)? Then reinstalled FS2K4? Make sure your antivirus program is disabled before reinstalling too."Hope this helps!Jim>>>>>>>>>>>>>>>>> Yes, I did this. There was no antiirus installed at that time! "Did FS run when you logged on as the Admin account as stated in step one of my previous post? If it didn't that means that FS is not acting properly (but you knew that alread... ) - since that is the default admin account, it can, in theory, do anything to the computer.I would reccomend uninstalling / reinstalling FS under the administrator account as stated in option 1 of my post.I'm looking in the MS KB now - will let you know if I find anything intersting."Dan >>>>>>>>>>>>>>> How I do this? >>> "I would reccomend uninstalling / reinstalling FS under the administrator account""Take a look at thishttp://www.microsoft.com/downloads/details...&DisplayLang=enThe patch doesn't seem to be what you need - but at this point - it could be worth a try..."Dan >>>>>>>>>>>>>> No patch needed I think, because there was never needed. "If you are reformatting your drive, but keeping a second drive with FS9 on it, then it could very well be a SID issue. Take ownership of the directory, and re-do the rights to it. If the security tab shows something like "S239-2358320-238342" instead of user names then it could likely be the problem. I hate Windows sometimes...If you have FS9 on a different drive, and didn't reformat that drive, this is your problem. Did you format your C drive but have Fs9 on another drive?" >>>>>>>>>>>>> Fs is in drive C: and I formatted exactly drive C: so, this option is also outr of question.What I want to do is to uninstall FS but being sure that the problem will not come, and that is what is happening all the time. When I install FS, the problem comes ... Solutions?Coimbra

Get a new Hard drive! You can get an 80GB for the same price as flightsim!

But the hard drive had never problems ...Coimbra

someone to explain how to install FS with administrator rights from the beginning?coimbra

Sure: See option one in my previous post (scroll up a little bit...); folllow the instructions in option 1 - get logged on as the root admin. Once logged on uninstall / reinstall FS - making sure that you install it such that ALL users can access it....

will try! I will report results!coimbra

CoimbraDo you only have one hard drive? If so are you SURE you reformatted it? Maybe you should run FDisk and remove the primary partition, and if it indicates any more partitions remove them. Then create a new primary partition, format, install WinXP, install FS9, and see if it will run. You may have to install a driver for your vid card, I don't know if FS9 can run on the generic VGA driver. I think thats about as basic as it can be done.David

I have 2 HD and disk C: I reformatted 4 times ...The other drive (D:) of course not, but it seems that there is no influence for the behaviour of the reinstalled FS.coimbra

Ok, maybe i discovered the problem. I installed FS and no problems. I installed addons also but there are 2 addons from one company that after the instalation, the message is displaying. What to do? reinstall the sceneries with administrator account? Because til that step no problems at all. I uninstalled those sceneries then, but still the message came.Asking for solutions. ThanksCoimbra

Coimbra: What to sceneries are we talking about? Is it possible that you can manually install them (lets say to a temp dir) and then move that folder into FS' Addon Scenery folder - then run FS and import the Scenery? Let us know!