legit check control, Account Unknown(S-1-5-32-547)

HI:

My hijack this log found a O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\. It continues to return after choosing FIX in Hijack This and rebooting.

Also I dont know if this is normal but in my Security Settings for LegEditCheck Control.....I see multiple users and an unknown account that has appeared out of no where with permissions set for FULL CONTROL. I have attacked a jpg file of this screen shot. Seems to me there are TOO MANY accounts with full access?

Im wondering if someone has access to my computer? with a trojan or virus?

Any help is greatly appreciated.

 

heres the screen shot
attached...sorry

and I do NOT KNOW who the first account unknown is. so I have DENY permission. Should I have these denied?
On the table where it shows INTERITED FROM, these funny looking ones say <not inherited> does this mean they are bad?

 

i did google it..........which is why i got suspicious. The unknown account, i just denied all priviledges on my account. It turns out its some sort of backdoor network.

Thanks