administrators group disapear

dear gurus

i hve strange experience of windows 2008 r2

i hve 1 ms sql server using on domain, somehow v remove domain it become standalone domain no more domain. ms sql is working fine no issue encounter

now the main issue is "administrators group" is disappear. when i saw administrator permission so it show me only "remote desktop users" and "performance log access to "

can someone assist step by step how to get back the administrators groups where to look into it. as adminsitrator lost role as administrator itself now

so i feel some issue is there

kind regards
Who is Participating?
Haresh NikumbhConnect With a Mentor Sr. Tech leadCommented:
can you verify you do not have configure GPO to remove Local administrator group from the clients?
tmsa12Author Commented:
i forget to update you i create a new user and try to assign administrator group permission but since no more group available so i cant give admin permission to any user at all
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