I'm running a file server with Windows Server 2000. The file server hosts a proxy to share the internet and deliver e-mail. Also, multiple users access an Access database located on the server. Now, no one can log onto the domain and when they try, they get "Server is not configured for transactions". I've checked and the administrative shares are missing. I can create them using net share IPC$, but like many of the other cases I've found on EE, they disappear again. I've ran startup.cop and found nothing. I've ran numerous antivirus and antispyware tools, removed everythinig that those did find, but still, no improvement on the shares. I've tried the Sasser removal tool and found nothing. I see that there are a lot of people on this site with this problem, but I'm not seeing many detailed procedures for correcting the problem. I really do not want to reinstall Server 2000, partially because of the downtime involved and partially because I'm not confident that it will fix the problem. Any suggestions?