Unable to log onto Guest account

  alternator 09:40 08 May 09
Locked

Running Vista Home premium fully updated. Firewall and anti virus upto date.
Son arrived for visit tried to log on to guest account on computer and gets the message."Windows unable to connect to Sens service, contact systme administrator" I have done a search for this problem, there seems to be a few people with the same problem, but all the solutions seem to have a free download software that will cure the problem, you do a scan and it tells you you have a problem, then you have to buy the software. I searched PCA but couldn't find any previous. I might not be looking in the right place
All the other accounts work. I tried to disable the guest account, reboot and then reactivated it, no luck with that. Any advice appreciated.

  alternator 18:10 08 May 09

excuse me refreshing just wondering if anyone has any ideas

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