You may get many errors in the Windows computer time to time. Though it is one of the most reliable operating systems in the world, occurring of the error happens gradually. Sometimes you resolve the error easily and sometimes you need to apply some more efforts to deal with it. Windows update error 0x800705AD is also one of those errors. You get the update error 0x800705AD in Windows due to wrong registry entries or due to improper maintenance of the computer. You cannot be able to update the Windows anyhow due to the error. Therefore, go with the manual or automatic error fixing methods recommended here in the article. You should use Advanced System Repair tool in the computer for automatic fixing of the error.