I don't know the whole story, but I'll try to be as detailed as possible with everything I know about the case...
Earlier today I was using the computer, like every day. Nothing unusual really happened while I was logged in on my user name in XP. So, I logged off to go somewhere, and about 5 minutes later I get a call from my sister saying that the computer doesn't load. Apparantly, my sister was able to reboot the computer, and it didn't really load when it turned back on. So, she told me she tried doing something like a "system recovery."
Right now I just came home and turned on the computer. All the users are deleted except for HP_admin. I turned on the computer, and it didn't even give me a selection of user(s). It simply said "welcome," and logged onto this user.
It looks as if the computer is in safe mode. Everything is larger than it should be on the desktop and taskbar. Plus, there's a little window on the desktop asking about turning on the internet, although I'm on it right now.
I really have NO idea what happened, this is really weird. Any help towards this would be greatly appreciated. This is a new computer that I only bought a couple months ago, and it'd be a shame if it was already messed up to a high extent. All of my saved files are still on the computer, but apparantly the users got deleted and maybe some other stuff got messed up.
If anyone can guide me in the right direction, please post. Also, if there's any other information you need to help me, I'll be more than happy to get it after you tell me how to get it. :P Thanks!