Why are ID's suddenly showing on my messenger instead of real names?

Yahoo messenger archive decoder????????showing 2 more yahoo ids that do not belong to me?

i downloaded yahoo messenger archive downloader and when i was amazed n shocked when i saw the list of profiles that were present in profile folders of yahoo messenger folder*(earlier it was hidden)my prob is there are 2 more yahoo ids that do not belong to me ...my comp is pw protected and i carry it with me almost everywhere i go ...how can it be possible that to other people have signed in their yahoo using my comp?the both ids are also in my contacts list though ...so is it possible that they are just showing coz they are in my contacts???but i think their presence in yahoo messenger profiles folder mean that they have been opened through my computer....what should i do ??
Answer:

Install firewall

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