The only way I get the error that you're getting is if I go into SAC and don't change localhost computer and do a local connection. When I click on...

Are you trying to connect using the Virtual OS name/VIP or Virtual SQL Name/VIP? It should be the Virtual SQL Name or Virtual SQL VIP.

This link should give you all the info needed to uninstall from a cluster:

http://support.microsoft.com/?kbid=922670&SD=tech

Check out this whitepaper: http://www.microsoft.com/technet/prodtechnol/sql/2005/bkupssas.mspx

We have the awe fix on several instances and have had no problems.