I downloaded minecraft_server.jar from here, and made run.bat which content is
java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui.
It runs well, I can connect with typing my IP, but my friend (Windows Vista - 32bit) couldn't connect to my server, even though he can connect to my Apache web server. (not the connection problem)
We had this problem months ago, and somebody told us the 32bit side (my friend) should open the server, and it worked.
However, my friends said to me that his computer is cr*p, so he can't run minecraft server well and asked me to find the way running minecraft server...
How to fix this problem - 32bit computer can't connect to 64bit minecraft server?