Failure adding assembly to the cache Windows XP SP3

Question

i am trying to add an assembly to the GAC but the error indicates that "Failure adding assembly to the cache: Administrator permissions are needed to use the selected options. Use an administrator ommand prompt to complete these tasks."

I am using Windows XP SP3 and user account type is Administrator. Please refer to the image below.

TIA

http://i.stack.imgur.com/TZXpc.png

Answer 1

I was able to solve my problem by additional commands via command prompt

C:\WINDOWS\system32>runas /user:computerName\administrator cmd

Answer 2

You are administrator on your machine but you don't run the visual studio command prompt (or cmd.exe) as an admin ...