Can Quickbooks do damage?

My boss installed quickbooks on a machine, then a few days later it crashed. I know this sounds like entirely a coincidence but two days ago we installed it on a different machine.

Yesterday morning I tried to start that machine and it started having issues booting with an external HD attached.

I unplugged the drive, waited for the machine to start, then plugged it back in, all good. This morning however, the machine will not boot at all.

I know it could also be the hard drive as it was attached to both machines as well, and I know it could also be a virus, but i'm just checking to see if there is any chance that quickbooks 08/09 could cause any such damage.

Thanks all