Update failures are a potential indication of more serious problems
Many Virus or Malware infections will attempt to disable “Windows Update” to ensure that security fixes cannot be installed to remove potential infections.
This problem is one of the most difficult to fix as it involves delving deep into the Operating system to facilitate its removal.
Even without the possibility of Virus/Malware infection the “Windows Update” system can fail, this leaves the system insecure and liable to future problems.