I hate to step in and comment at the risk of causing more flames, but I think a few things are being mixed up.
1) Yes, there are some Microsoft KBs about this, but the main point is that they explain how to recover when anything should delete those files. They do not say the MS has a bug that deletes them.
2) I kept a window open that watched the C:\ directory while doing an EMC10 install. I watched the files (in fact, all files in c:\) disappear while it was running. I had killed all other processes that could possibly conflict with the installation so the only things that could have deleted the files was the EMC installer. I knew to watch the directory because the deleted NTLDR had already bitten me once trying to install EMC10.
3) Roxio has published a patch that prevents it. The Roxio article is here >
note the comment in the article that says: "Important: After installing Easy Media Creator 10, it is recommended to run software manager for any available updates to prevent the issue such as "NTLDR is missing" from re-occurring. "
Of course, since you can't install the patch until after you have installed EMC10, it is too late and the damage is done.
4) I believe it does not strike everyone because the file attributes should be R(ead only)S(ystem)H(ide) and that, presumably, protects against the bug. I don't know why those files did not have those attributes set before on my system, but they certainly do now!
5) There are many many software bugs that hit only a subset of users. This does not mean that it is not a bug but shows how the many combinations of software products, and the order in which they were installed, causes different reactions.
I am trying to be constructive with these comments and I hope they are taken for what they are intended to be - helpful.