Registering dll in winXP is simple just drag and drop in the assembly folder. But when you try to do it in windows 7 it would say somethnig like " Access is Denied ". To get around this use - gacutil.exe utility. I had this on my system in the following path. "C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin" use the below command to register user or third-party dll. C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin> gacutil.exe /i "<DLL_PATH_HERE>" Posted via email from What I See