My weekly Windows Backup failed with Error code: 0x81000037, which is a bit odd.
I googled the error and got to the Microsoft help page which explained:
0x81000037: Windows Backup failed while trying to read from the shadow copy on one of the volumes being backed up0x81000037: Windows Backup failed while trying to read from the shadow copy on one of the volumes being backed up.
It also contained a work around, but this proved to be incorrect for my issue!
So, I checked the Windows event log 'eventvwr.msc' and found the following in Windows Logs->System:
'Microsoft Antimalware has detected malware or other potentially unwanted software.'
Turns out that the Java Cache on my PC had something looking like Malware in:
So the Backup refused to work, which I guess is a good thing if only the error message had been clear.
To play it safe I deleted the folder 'Users\.....\AppData\LocalLow\Sun' and all was well.