I had problems similar to that recently...
Make sure you have the most up to date drivers for your graphics card...
I reinstalled DirectX 9 and redownloaded MacromediaFlash.
After that all ran well. 
Make sure you aren't running anything in the background that might interfere with the game...shut down as much as you can and leave systray and explorer running.
I had lockups when I was running a weather thingy Lol...when it connected to update the temperature I locked up.
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Maple Story: Drewcilla, Level 53 Lightning Mage, Scania. Son: MicronX, Level 46 Spearman, Microsniper Level 19 Archer, Scania. Hubby: LEGALOS10, Level 83 Ranger, Scania
GUILD: Shadowsz - Scania
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