I ran elevated command prompt. I get the same issue - "access is denied" when attempting to run the command "ren c:\windows\SoftwareDistribution softwaredistribution.old".
I already stopped the Windows Update service - I did this by
opening services and stopping it that way (run "services.msc /s" then find Windows Update on the list of services and select 'stop'. Hence when running the command "net stop wuauserv" in elevated command prompt,
it says "The Windows Update service is not started"). And yet if I attempt to rename SoftwareDistribution, either in Windows explorer or through the elevated command prompt, it doesn't work - apparently because it is open in another program.
Which other program might this folder be open in, besides Windows Update?
Is there a way I can find out?
Help would be massively appreciated - not nice to run into such a serious problem (can't update any applications) on a brand new laptop.