Oh dear what have they done, RC is broken in places

Oh dear what has Microsoft done... I have used the beta since it came out without major issue but, now with a clean install of the RC I find I simply cannot work with it. I have had to go back to Vista only.
The reason - can't get logged on to our network at work nor can I get User Account Control to open.
Here is what I need and what I did;
I need to be able to logon to our LAN, I made sure all details that are required and worked for the beta of 7 were there and indeed I can get onto the Internet but, when I try to Map a Network Drive I keep getting a message saying no such user exists on the Domain. I have made sure the Domain is correct, etc, etc, but, no amount of trying gets me past this message. I have consulted our in-house PC officer and he does not know any more than myself about this.

I wanted to get into the User Account Control applet but, when I click on the Link in Control Panel the waiting cursor does just that - it waits. Never changes and the applet never opens.

Come on guys, I mean how can you break something in a RC when it was working well in beta??

Having been computing and installing systems for many years now, I'm glad I have Ubuntu to fall back on at home - it just works!!

just with u, we have no such problems, we are on 7137, RC has some problems but not as u say... Where did u download the RC from... Check the ISO with Hash numbers and try to burn on different media and try to re-install...