The Houston Texans are not pleased with themselves, and neither is their Week 5 opponent, the San Francisco 49ers.After starting off Week 4 the right way with a big win at St. Louis, the 49ers bitterly watched the Texans blow a huge fourth-quarter lead at home in an eventual overtime loss to Seattle, allowing the Seahawks to maintain their two-game lead over the 49ers in the NFC West.San Francisco will try not to fall further behind when it welcomes the shell-shocked Texans to Candlestick Park on Sunday night.