I've got the same problem just started but for some reason there are no
system restore points available either.
When it first started I did a restore to about three days prior but it
didn't help. I wanted to do a deeper restore but they've all gone.

"Mrmars" wrote:

> FYI - a system restore solved the problem.
> --
> Mrmars
>
>
> "Mrmars" wrote:
>
> > I'm pretty confident that's not the problem as I'm pretty anal about computer
> > security. They don't spend lenghty amounts of time on the computer. When they
> > do its usually just to type a school paper or something. I can't even logon
> > to the "guest" account which I just recently activated.
> >
> > Problem not solved.
> >
> > --
> > Mrmars
> >
> >
> > "usasma" wrote:
> >
> > > Sudden problems, especially with kids on the system, are usually due to
> > > spyware/malware. You can get a free online scan at
> > > http://housecall.trendmicro.com
> > >
> > > Good luck! It's a constant battle with my kids (they won - I gave up and
> > > got them their own, heavily protected system).
> > >
> > > - John
> > >
> > > "Mrmars" wrote:
> > >
> > > > I currently have two user accounts set up on my machine. One for myself
> > > > (administrator) and one for my kids. Up until yesterday there was never a
> > > > problem switching users. Now upon attempting to switch the computer just
> > > > hangs up and never switches users. I attempted to switch last night before
> > > > bed. I put in the password for my kids account and went to bed. Upon waking
> > > > up it still had never switched. It was hung up on the "Welcome" screen all
> > > > night long. I had to manually shut the machine down.
> > > > --
> > > > Mrmars