Missing msvcp71.dll error

Try removing all visual effects right click My Comp > properties > performance > adjust best for performance.

You should be back at windows classic...see how it goes. Fixed things up for me in 7, though might not work on XP since GUI's rendered differently...

Also, don't play and video's when playing, I find affects how much I lag.

Il try it but i dought it will work, you see, the problem isin't performance.
Somehow, the lack of this certain .dll causes the game to get frame skips, and its not only hapenning with maplestory, its happenning with some of my other games as well.