I download today the assmbly for DevExpress 8.1.1 and put the files in Microfour folder, but (I have this same problem with 7.3.8) when I drag to C:\Windows\Assembly the files a message shows saying "Access denied" I'm runing Windows Vista

Be sure to also drag the DLL into the GAC (C:\Windows\Assembly).  Once done, go back into Visual Studio and this assembly will then support the 8.1.1 version of DevExpress.

Thanks for your help

Regards

Everything is possible, just keep trying...