Folding to a check raise on flop or turn w no reads

If I just sit down to a game, and I have no reads on the players, what's the right play when they check raise. I'm playing online poker right now, and I sat in 2 different games where they check raised me. One time I get AQ and lost to Aces and Fours, and I lost another hand w top pair w a good kicker. If I'm no or have absolutely no reads on the person, and they check raise... should I just throw it away most of the time because I'm beat? What's the probability I'm losing? I'm feeling people don't really check raise bluff, semi-bluff, or have a flush draw in low-limits? Should I just fold the hands w top pair on the river if I don't improve? If the probablility that I am losing is over 50% of the time, shouldn't I just fold?

Hiphop, all your posts have sucked, some even worse than this. You clearly have no idea how to play. Go read theory of poker and small stakes hold em. Then return to the forum.