Win XP and Yahoo Messanger

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I'm facing real bad experincing with yahoo messanger in my windows XP machine. Whenever I download and isntall it it carshed and stops the service. I done afrsh inssaltion and tried but no avail. But few weeks back I manged to run without any hickups. Can anyone tell me is there any known bug with yahoo messanger or any new fixes out there to apply. I really don't find any info or help in the yahoo web site for this.

* Hope this is the correct place to post this message if not bare with my mistake.

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This is very strange looks lik eI'm the only person who have came across probs with yahoo messanger in windows XP. Well I even mail to yahoo and they say remove the background services and try to install and see, but I couldn't do it due a strange problem. When I try to kill the services especially the svchost.exe services (there are 4 showing in my machine) my machine get the famous 60 seconds machine shutdwon screen. I ran the blaster worm removal tool and even applied the ms patch for rps probs. But no viruses found but again when i kill them machine gets restarted withing 60 seconds. Can this be a virus or is it auto generated by the windows? Hope somewill have the answer till I search it in the web.