Windows Server 2003 Logon Problems

Okay, this is aggravating the hell out of me. I run Windows Server 2003 on my desktop. It's been doing great for quite a long while. Now, I was sitting there, watching TV with my TV Tuner...when it froze, as in no input was allowed. I couldn't move the mouse, type, or anything of the sort. So, being an avid Winblows user, I did a hard-reboot. Upon restarting, I wasn't allowed to log on...any ideas? I type in the password for Administrator (the only account I know of), and click okay. It logs on, says "Applying Your Settings", then logs off. The 'Applied Settings' go no further than my desktop background color...
Why am I not allowed to logon, and how to I fix this?


A_T

I don't know the answer to your question and hopefully someone else will but I just have a tip for you. Don't run as admin make a seperate user account for everyday use. I don't have any solid information. It may just be some myth I built into my brain and somebody around here will correct me if I'm wrong.

Well the thing is, I'm learning about security (or the lack thereof) from this thing. I also install/uninstall apps constantly. So I need admin rights...to create user accounts and install apps and such. I've been told the same thing, but I just never really followed it....because sometimes, even if logged on as another username with admin privilages, I still can't do everything.