Error on boot: "STOP c0000135 unable to locate component csrsrv.dll not found reinstalling the application may fix the problem"

I am running Windows Server 2003 R2 (I know it's old, I'm in the process of upgrading it now to 2012) on an old HP ProLiant server. It's worked for ages, but yesterday morning it booted up with the blue screen of death, saying:
STOP c0000135 unable to locate component csrsrv.dll not found. Reinstalling the application may fix the problem.
I have tried coping the file from C:\WINDOWS\ServicePackFiles\i386\csrsrv.dll to C:\WINDOWS\system32\ using a WS2003R2 recovery disk, but it still doesn't work. I'm not sure what to do now...
I do have backups, but I'd prefer just to get this server back up and running so that I can continue to migration so that I can decommission it permanently and put it out to pasture...
Any help and guidance is greatly appreciated.
Thanks in advance!

If copying the DLL does not help then I would recommend doing a system state restore from a backup.
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