User "ASP.NET Machine A"?

I had to reboot my computer this morning and, for the first time ever, it
asked me to choose an account.

Since I never created any account other than the Admin account I was stunned
and flabergasted. After I rebooted I looked in the console under User
Accounts and found a completely new one I never created called "ASP.NET
Machine A".

The only software I installed since my last reboot was the .net Framework
1.1 in order to be able to run a utility for a game and updated my Norton's
Anti-Virus subscription.

Did the install of the .net Framework create that user account and, if so,
will there be any problems if I delete that user account? This is my own
personal home computer and I don't want more accounts on this than just the
one so it will boot up without asking what account to use.

Thanks.