You might want to look at your CDRW drivers or even firmware flash. This could be related to anti-piracy type stuff. Either SP2 or RTW might be triggering off something they see with the burner. This has happened before, but I don't recall the message that you are getting.

As was suggested, reducing firewall and security settings might do the trick. I suggest disconnect from the internet and cutting them back to min, then installing. Then re-enable and reconnect to the net.

Kraellin also found a way to delete all RTW related registry entries to cure a problem with installing the patch. There might be something helpful there. I can't point you to the thread though. It was a couple of months back in the Apothecary. Man I miss the search function...the current lack of search is like having no long term memory.