I hadn't noticed that option before - while I am selective in the repairs it runs, I tend to run it with default settings.
As for the validation check, I've occasionally experienced just as a member on here has, that it failed the validation check and the program needed to be reinstalled.
I don't know why that happens, but Shane is obviously aware that it can and included that check in its start up procedure.
If you could run the program when it was corrupt and gave you problems, would you know what the cause was ?
Any diagnostics/repairs will take the time it takes, so I think a degree of patience is required when carrying out such procedures.
The longest I've heard of a chkdsk /r to complete is 36hrs - how would you handle something like that ?