asp.net machine account

I am still miserable and having fits trying to get around or get rid of this
asp.net machine user account. I can't access many of my programs like system
restore. I am denied access to many of my programs because it says that it is
the administrator, and I don't have permission. I can't make myself the
admin; and it won't delete or uninstall. Is ther anything that someone can
tell me in laymans terms, how I can get rid of asp.net. I hate it and it is
driving me crazy. I didn't have these issues before I upgraded to vista home
premium. Somebody please help me. I have tried to change permissions. Change
user accounts. Cannot uninstall some programs because I get a message saying
someone else is using it. Don't know what to do.