Strange (foreign) users list in get info/permissions window!

Background info: OS up dated to 10.7.4.   I am the admin.  Husband is standard user. One group, which includes my husband and I.  One guest (no sharing) account created.  I can connect remotely to my mac with admin login info.
1. When, applying read and write permissions to HD for the "owners" group  (which i created)
"The system extension “/System/Library/Extensions/Accusys6xxxx.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update." 
and
"The system extension “/System/Library/Extensions/acfs.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the product’s vendor for an update."
2. I created a shared folder (users/me/public/shared)for my husband and I to have dual read and write access. I made this folder last year.  Tonight i clicked "get info" and a user named "wheel" had read and write access.  I did not create this user.  Also "_guest" and "guest"  were listed under names in permissions.  They had read only access. Additionally, here is a "staff" user and "everyone" users(are they default users).  Can I delete all users but admin (me, my husband and our group? "
3. Several times over the last few months, I was concerned about unsual OS performance.  I used the disk ustitlty to repair permissions. I see the following often in my repair log.  What is "LockScreenLeopard.app"  and what does "drw-r--r--" mean?
Permissions differ on “System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/LockScreenLeopard386.app/Contents/Resources/da.lproj/MainMenu.nib”; should be -rw-r--r-- ; they are drw-r--r-- .
Repaired “System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/LockScreenLeopard386.app/Contents/Resources/da.lproj/MainMenu.nib”
Do I have a hacker?  Do you all use antivurus/spyware software these days?  If so what app?

pzeitler, i tried your fix. it worked but only partly. i had to go to an admin account and do the sudo because my non-admin account that was affected does not allow me to sudo from it. so i do it from admin account and it seems i add my non-admin user to all admin files\folders with full permissions and no admin account user. so i open the home folder in get info, add admin user and set permission, apply recursively to all inside it. How ever, i couldnt remove the non-admin user from admin user folder permissions.
now i go to non-admin user account and find that unknown grp is gone for all except three folders (public/sites/downloads). i also checked a third, non-admin user and it seems unaffected by all the operations that i have performed. but it has the unknown grp in it.
I guess i have to wait for apple to fix it rather than mess up the system myself.

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