We are working on a C#.net GUI based application that reads data from USB at a faster rate and then plots in the GUI with the help of a plotter . We are trying to elevate the priority of this process(Entire application) to "Real Time" . This works under Windows XP . But when the same code is run on a Windows 7 PC , the Process is NOT elevated to "Real Time" priority and in turn it is changed to "High" . Under these circumstances , we are incurring data loss in USB layer on a Windows 7 . We tried logging to the same Windows 7 PC using a "Administrator" login/password and we were able to set the priority of the process(Entire application) to "Real Time" and there was NO data loss in USB layer. Now , why we are not able to elevate the priority from our application to "Real Time" using code when we are logged in as normal user with administrator rights but not in "Administrator" login ?

You must the Increase scheduling priortiy privilege (SeIncreaseBasePriorityPrivilege) to change the priority to real time."A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Hello Andre.Ziegler, Thanks for your reply. Is this something that can be done through code using C# or any other way? Or is this part of a Group Policy that can be edited through GPO editor ? Currently we have restrictions to change the policy for the current login Id . I found something called NTRights.exe that is shipped along with windows ? Will this be able to help us changing the priviledge mode from a normal user login ? Expecting your reply !!! Regards, Yashath

Hello Andre.Ziegler, Thanks for your reply. Is this something that can be done through code using C# or any other way? yes. Uses this .Net library: http://processprivileges.codeplex.com/"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Hello Andre.Ziegler, Many Thanks . Will check this out and get back . Regards, Yashath

Hello Andre.Ziegler, We tested out the code you pointed at http://processprivileges.codeplex.com/ We logged in as a normal user(Not an Administrator) in Windows7 and we got the following output(privileges) only . Shutdown => Enabled ChangeNotify => Enabled Undock => Disabled IncreaseWorkingSet => Disabled TimeZone => Disabled Also we tried logging in as an Administrator in the same Windows7 PC and we got the following privileges . ChangeNotify => Enabled Security => Disabled Backup => Disabled Restore => Disabled SystemTime => Disabled Shutdown => Disabled RemoteShutdown => Disabled TakeOwnership => Disabled Debug => Enabled SystemEnvironment => Disabled SystemProfile => Disabled ProfileSingleProcess => Disabled IncreaseBasePriority => Disabled LoadDriver => Enabled CreatePageFile => Disabled IncreaseQuota => Disabled Undock => Enabled ManageVolume => Disabled Impersonate => Enabled CreateGlobal => Enabled TakeOwnership => Enabled (PrivilegeModified) It is very evident that we get the "IncreaseBasePriority" privilege only if we log in as Administrator . By any ways can we do this in the Normal user login in Windows 7. Please let us know your thoughts on this . The same program works perfectly as expected in Windows XP , but not in Windows 7 Regards, Yashath

The same program works perfectly as expected in Windows XP , but not in Windows 7 also for normal users? What is the Privilege output for XP?"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Hello Andre, This is the output that we get when we run the first two snippets on a XP machine with normal user login. TakeOwnership => Enabled TakeOwnership => Disabled /**********************************************/ ChangeNotify => Enabled Security => Disabled Backup => Disabled Restore => Disabled SystemTime => Disabled Shutdown => Disabled RemoteShutdown => Disabled TakeOwnership => Disabled Debug => Enabled SystemEnvironment => Disabled SystemProfile => Disabled ProfileSingleProcess => Disabled IncreaseBasePriority => Disabled LoadDriver => Enabled CreatePageFile => Disabled IncreaseQuota => Disabled Undock => Enabled ManageVolume => Disabled Impersonate => Enabled CreateGlobal => Enabled TakeOwnership => Enabled (PrivilegeModified)

this is no normal XP. This is an admin account. Loading of drivers is not allowed for normal suers."A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Hello Andre, We fixed this issue by adding "application.manifest" in our project and changing the requested execution level from "asInvoker" to "asarequireAdministrator" level . But even then this needs a Local admin rights and not a "Administrator" login account. Thanks & Regards, Yashath

this is by design. The name is UAC (User account control). You get a filtered token with user rights until you request admin rights (manifest, or selection "Run as administrator")"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/