Micro$oft, for a million good reasons.
Western Digial and Seagate, last time I worked in a geekshop, we got a batch of each with 50%+ return rates, and some of the most heartbreaking noises I've ever heard from a disc.
Packard Bell, OMG! mate had a PB monitor with speakers once....the speakers, which were designed and fitted to the monitor by PB, gaused the screen to the point of unusability, and when the modem in same machine refused to work, we opened the case to find it was in at am angle with only half the edge connector making contact.
Not really PC, but hi-tech...Yamaha pro-audio gear, though often very good, gives me ulcers. OS's are insane and manuals make "all your base are belong to us" seem like The Bard.