That might be why it can't be found, because yes, anyone who owns a PS3 copy can tell you that the AVERAGE user cannot play more than 2 out of 4 DLCs. It's not so much bugs as it is file size creating crippling lag to the point where the game becomes unplayable, so every character on the PS3 version is on the clock, so to speak.
Either get Microsoft to replace your Xbox (RRoD?) or honestly, invest in a mediocre desktop. Computers tend to improve their specs pretty fast and the game is just shy of being three years old, so I'd imagine a decently-priced computer would still be able to run New Vegas flawlessly. And yeah, from personal experience? Laptops ARE pieces of garbage, so get a desktop.