no entry point found ntdll.dll

i recently removed a rootkit from this machine and a few days later it came back in the shop with the start of another kit but now it is giving me an error i am unfamaliar with and malwarebytes/spybot didnt find any associated reg key or anything that has fixed this yet but here goes.

when trying to run many programs, including combofix.exe (i really want to run combo fix the most)i get the following message

RtlReleaseRelativeName no entry point found in ntdll.dll

this message pops up while autoruns are starting up and when i try and more importantly while trying to run combofix.exe.

Erd50 didnt find any system files to repair, chkdsk is clean, cannot run system restore in erd50 to try and revert files back to a previous condition as system restore tool closes itself when running. I fancy myself pretty experienced with malware removal and i have never seen this ever. WHAT AM I MISSING HERE?

 

yes it is windows xp, i haven't tried a full sfc /scannow because i didnt have an install disk handy, I did however start one and it immediately asked for an install disk so that may help.

I did use the ERD50 SFrepair tool but i don't believe its as thorough as sfc /scannow.

another method i tried for repair was searching for all files named ntdll.dll and replacing the one in system32 with the different copies hoping this would resolve the issue, it didn't. So now im not even sure that the issue is the file itself or the registry, or blah blah etc.

EDIT: also i tried manually registering ntdll.dll with regsvr32, and it gives me another new message for me, ntdll.dll has been loaded, but the DllRegisterServer entry point was not found...

 

II will give them both a try, I just dont want to have to recommend the cop out of a format and windows reinstall, i want to try everything for repair first.

 

sfc scannow worked! hallelujah, then was able to use combofix, and yep still a rootkit present, this was a really really awful rootkit, never seen one this hard to remove