I just installed a Windows 2003 Standard Edition (R2) and promote it as a Domain Controller, at the very beginning, it works perfectly. However, few days later, I found that it is very slow and only 200MB ram left (total 1GB), when I open task manager, it indicates lsass.exe consumes around 600MB of memory, now I would like to know is it possilbe to disable it or remove it. Thanks in advance.
PS. I also installed DHCP, IIS on that machine but they are not in use.