Greeting's

I have a windows XP home edition with SP2 and all other updates.
Today while i was checking all user account's I found two unknown user account's (I used net user command)

one is KAd7zBUZTiQ2Ot
and second one is SUPPORT_388945a0.

I have disabled remote help. I had never created any account with that as login name.

Any idea why those account's showed up there ?