ScanRegW.exe
(Microsoft)
Microsofts Registry Checker. This is not a Task List item, but rather a startup item which you can see in MSConfig or Starter. The Registry Checker, SCANREGW, loads on boot-up and checks that the Windows Registry is in good order. If it is in good order, it backs up the Registry and then lets Windows continue booting up. If there are minor problems, it fixes them. If there are major problems, it prompts the user to restore from a previous good copy of the Registry. Once SCANREGW has completed one of the above, it terminates, so it should never appear in your Task List. By default the Registry Checker keeps 5 backup copies of the Registry in the C:\Windows\SysBckup folder these backups are compressed into single .CAB files called RB000.CAB, RB001.CAB, and so on.
Recommendation :
Leave well alone. Note, make sure that the name of the program file is indeed SCANREG W .exe, and not some other name like "scanreg v .exe" which would indicate a virus.