Potlimit-Holdem

I got a new computer yesterday. My old one crushed after 5 years of usage :-(
Therefore, I was not able to play for 2 weeks and had to do something different in that time. I read Super System and Harrington 2 different times and I am impressed of the quality of both books.

Yesterday I got my new computer and had to adjust to the Windows XP graphics and just played 1 hour. 9 dollars win and close to 2000 dollar bankroll.

Two hands:
a) KK in LP. On raiser in front of me, I raise 3x his amount, he called in EP. Flop 852, he leaded for 5 dollars (1/2 Pot) I thought for a while and just called. Turn Q. Bad card. He went all-in for 25 dollars. I folded. What could he have with which he called a reraise preflop and play so aggressively after the flop? AA-QQ I guess. Against AA and QQ I am dead. Fold okay?

b) 55 in EP, I limp, one raiser, one caller, I call, too. Flop 965 rainbow. I bet pot, raiser raised, other caller folded, I reraise and we were all-in. He had QQ and lost a huge pot.

MHFlush