Was there a problem talking with Raja? I am doubtful that support is going to be able to fix a networking/RAM/SQL issue. Nothing against them. I would highly recommend working with a SQL specialist until you can rule that out. But, it also sounds as if there are problems overall. There are also, as you know, better tools than task manager to troubleshoot with. AC on my computers use almost 200MB of RAM easily. Shouldn't do anything with CPU on server or RAM. The only thing taxed over there would be SQL.
If I am correct, you still have only 2GB on the server? If there is an issue either way with my friend, PM me.