attach-to-process

I followed the instructions in this link: http://msdn.microsoft.com/en-us/library/bt727f1t.aspx to install the remote debugger (2012) on my server where the application is running in hope to debug it remotely from my dev machine running visual studio 2012. I cannot even get as far as viewing the list of processes to attach to on the remote machine. I keep getting "Unable to connect to the Microsoft Visual Studio Remote Debugging Monitor named [name]. Invalid access to memory location". I have managed to successfully connect a few times but then the attach fails immediately then I cannot

A few days ago, the attach button in "Attach to process" dialogue became disabled in VS 2010 and VS 2008 likewise. At first I thought that it is just an extension I've installed in VS 2010 but then I noticed it is the same in VS 2008. The both VS's a re running in administrative mode and on Windows 7. I looked around but I can't seem to find a solution to this. If anybody has encountered an similar problem, a little help would do great. Thanks upfront. EDIT: Attached a picture of the dialogue! Where it says you should press 'Select' and ensure at least managed is ticked. (or choose automatic)