Download the file from here:
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There is a file inside it named fltlib.dll
extract it and then copy it to the location
C:\Windows\System32\
It means in drive C under folder Windows then subfolder System32
it will ask you to replace the old.. press yes.
then press “windows key”+R
Windows key means a key on your keyboard with MS Windows sign on it..
and type or copy paste this:
Regsvr32 “C:\Windows\System32\fltlib.dll”
and then press enter.
Try to run ad aware after that.
If not then use Malwarebyte Antimalware
Pirated or authenticated.
Do reply if it solve your problem for future references.