Serevr 2003 SBS Admin account is corrupt

I can no longer log onto the admin account on a SBS 2003 server. It is corrupt and loads a temp one. I also cant make changes that affect registry, log into exchange system manager to name a few. Any ideas on how i can fix this. I have had experience with corrupt XP profiles and they are fairly easy to fix. Create a new user account, log into it, move corrupt profile settings and such in to new account with admin priv, etc. However i cant log in to the server with any other account, it says it cannot log int interactively. I added it to admin group. Any ideas?


Thanks

 

Ok i fixed it, sort of. ALWAYS CREATE A BACKUP SYS ADMIN ACCOUNT!!!
I used an old backup sys admin account that we setup a long time ago for no reason. Without it all i could do was add user accounts to group, all other mmc functions in any msc file would not work. I can access everything now. This should be a cautionary tale:
ALWAYS CREATE A BACKUP SYS ADMIN ACCOUNT!!!

Thanks.

 

And make sure it has a very secure password (more than 8 letters (more than 15 better), use upper and lower case, numbers and special characters) otherwise its just an easy back-door for a hacker.