Oh boy, I hope it's not as easy as I think it is and you followed that
guy's directions.... ehh...
Ok, I don't know if you know how to look at the users and groups so I'm
going to instruct you how to get there. Click on Start > Run, and type
MMC and hit enter. Click File > Add/Remove Snap-in, click Add, Scroll
down to Local Users and Groups. Select it and click Add, click Finish.
Close the "Add Standalone Snap-in" window. Click Ok on the "Add/Remove
Snap-in" window. Click the + in front of Local Users and Groups. Click
on the Users folder. On the right hand side of the window should be a
list of every user on your computer. If the account is still listed
there you have a chance to get it back. If it actually HAS disappeared
then you're screwed!
If the account is still listed double-click it. Click the Member Of
tab. If nothing is listed in the Member of: field, that's your problem.
Click Add. Type Users in the "Enter the object names to select" field
and click Check Names. Click OK. And that should do it. It should show
back up on the start window.
If I'm WAY off and I sent you on a wild goose chase, I'm sorry

but I
just had this happen to me last week, so I know in my situation it
worked. I have XP pro though, so I don't know if you have Home it might
not work.
Later,
-Clang
SonicClang