Error Code 80070643, Unable To Update Or Perform System Restore

I am trying to rectify the error with windows update. Everytime I try to update it tells me it is checking for updates...Then "To check for updates, you must first install an update for Windows Update. Your automatic Updating settings will not change." I click Install now and get "Window could not search for new updates"An error occured while checking for new updates for your computer. Error(s) Found Code 80070643 Windows Update encountered an unknown error.

This problem first came to light a year ago when I downloaded a windows update that was corrupt.It forced the computer to loop the autocheck upon boot and could only be started in safe mode or by canelling the check.After looking through the forums I found an interim fix which disabled the autocheck and since have always recieved the message upon restarting "Autocheck program not found".I naturally thought this issue would be resovled in the next update and or a future fix.I had to go away for work at the start of this year and when I got back and windows updated it still had the autocheck message.Recently I have been unable to update at all due to the aforementioned error. The simplest soultion it would seem would be to do a system restore, this I have tried however every possible point seems to have a corrupt file on it.I ran a scan using Malwarebytes and found nothing.I don't want to format as the programs came pre installed and that would mean taking to back to the shop.