Hello All! HELP!Im running win7 on a Domain that has Server2K3 and XP clients. Have got the majority of programs working with the excellent compatability mode on Win7. however I'm trying to run Citrix Proram neighbourhood and get an error "An installation file is required by NTVDM is missing, execution must terminate. C:\Windows\system32\ntio.sys choose close to terminate the application." Any suggestions please?????

This article would be of interest to you http://technet.microsoft.com/en-us/magazine/ee767578.aspx but you must be running a very OLD version of Citrix. However your scenario seems to be a 16bit app which should be run in Windows 7 XP Mode (see the article)MCSE, MCSA, MCDST [If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.]

Hi,C:windows/system32/ntio.sys, is a valid Microsoft windows application that is simply telling you that theres a missing component in what you are downloading, just like itunes needs to be installed and comes with real player, if you uninstall realplayer, itunes will not work for you, same with Citrix Proram neighbourhood.I hope you have followed the instruction exactly during the installation. You may have to find out what these missing components are and install them first.Aslo type: "SFC /Scannow" (without quotations) from start, this may replace related system files. Refer to http://www.blitzbasic.com/Community/posts.php?topic=59708.

Hi,Have you tried SFC?

I agree with cdobbs, the Citrix program seems to be a 16bit application, it is recommended to execute in Windows XP mode. For references on troubleshooting MS-DOS based programs:Troubleshooting MS-DOS-based programs in Windows XPBest RegardsDale

I'll give it a try. Thanks!

My PC is a Dell Optiplex 755 which doesn't have the Virtualization option in BIOS. I've enabled what I can but still get an error. Therefore I cannot run XP mode!