Hoping to get their first win of the season, the Rams went home, donned their throwback uniforms, and prepared for a Week 5 duel with the Minnesota Vikings.  Even though quarterback Marc Bulger was almost back to 100% health, backup quarterback Kyle Boller got the start. In the first quarter, St. Louis continued to struggle as Vikings running back Adrian Peterson got a 5-yard touchdown run and defensive end Jared Allen returned a fumble 52 yards for a touchdown.  The Rams would get on the board in the second quarter with a 29-yard field goal from kicker Josh Brown, but Minnesota came right back with kicking Ryan Longwell nailing a 47-yard field goal. The Vikings would continue to make their presence felt in the third quarter with quarterback Brett Favre completing a 13-yard touchdown to tight end Visanthe Shiancoe.  Minnesota would follow it up in the fourth quarter with Peterson's 7-yard touchdown.  St. Louis tried to rally as quarterback Marc Bulger completed a 27-yard touchdown pass to wide receiver Donnie Avery, but the Vikings would close out the game with running back Chester Taylor's 1-yard touchdown run.. In which quarter did the Rams score their first touchdown?