RCMD and other issues

We have a computer that started out with a problem logging into an Intranet
site of ours. The user on that machine only gets an error and this site uses
windows authentication to logon automatically. Anyway, another possibly
related issue is that the ability to RCMD to the machine does not work
either. We have tried to drop the machine from the domain and rejoin and it
seems to work for 5-10 minutes and then it goes back to the same problems.
You also cannot access the event viewer, services, etc. remotely through an
MMC. Other things like logging in and using exchange email works for the user
though. Any ideas on what could fix this issue? Thanks in advance!