I'm not sure if it really applies here, since you started the original thread over there last December, back when 3719-post dhc014 was thrilled to be posting his 1000'th post.
But, you have resurrected the thread simultaneously. Still, thanks for coming clean and linking to your other posts. By the way, that thread must hold some sort of record for slow-motion posting.
I don't know what to tell you about fear of killing your drive. There is some chance of damaging it, but if it isn't working properly anyway... And the C300 is designed for problems with XP, which you seem to be having, so it seems like it would be worth a chance. To improve your chances of success, make sure that you have reliable electrical power and no CD in the drive while flashing.