Service_Boot_Start error on v2v conversion

I am trying to do a v2v conversion with the 5.1 standalone converter on a windows 2008 r2 VM. I am doing this to shrink the system partition which was wrongly thinly provisioned at 415 gigs down to 100.

It gets most of the way through and I get an error that says "An error occurred during the conversion: "Cannot change bitmap driver's start type to SERVICE_BOOT_START, context="IncrementalConversion(job-1:0)-[52 d2 11 61 2b 43 41 85-6d if 90 5d 6f c7 94 90]", error=0'

I've looked this up on the internet and there isn't anything that I can find on this. Does anyone have any ideas what I can do?

Thanks so much in advance.