I've never seen a minimum requirement set for extracting tystreams or authoring and burning TyDVDs. Suffice it to say that when dealing with video on a PC there are a couple of things you should consider. Get the fastest CPU and a decent amount of RAM (128MB as a minimum but more couldn't hurt). A 7200rpm hard drive is also recommended for video processing. While these are not absolute, I believe they are reasonable guidelines. My current PC consists of an Athlon XP 1600+ CPU with 512MB RAM and a 60GB 7200rpm hard drive. I'm considering a larger hard drive because video extraction can fill it up in a hurry. 7200rpm drives with large capacities seem to be the norm these days anyway and the prices are dropping all the time so there's really no reason not to get the biggest drive you can afford, as long as your BIOS can handle it.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!