U.S. stocks wavered on Thursday despite signs of improvement in the U.S. labor market ahead of Friday's jobs report. Nonfarm payrolls in June will be closely scrutinized for signs that weakness in May was momentary. Crude oil turned lower after a smaller-than-expected decline in U.S. inventories. Stockpiles fell by just over two million barrels in the past week, around a third of what analysts hoped for. Pivotal Research now sees Comcast (CMCSA) shares reaching $75 ecah, 15 percent higher than current levels. Analysts reiterated a buy rating and said higher data speed should drive revenue. Avast Software agreed to buy antivirus software developer AVG Technologies (AVG) in a deal worth roughly $1.3 billion. The purchase expands Avast's presence in security software. TheStreet's Keris Lahiff reports from Wall Street.