read dosbox's message when you start it
what is your dosbos version?

Dosbox emulates old gameport joysticks. Basic PC joysticks had at most 4 analog axes and 4 buttons. Some more advanced joysticks multiplexed 16 buttons into the 4 button inputs (but with multiplexing you can only press one button at one time). Additionally, the game has to support advanced joysticks explicitly (for example: descent is pretty good, tie fighter not).

You can switch axes with dosbox's keymapper (ctrl+f1). Looks like the 360 controller has two analog sticks and a d-pad. The d-pad probably shows up as two axes in Windows (like both analog sticks), so you have 6 axes in total. You'll have to give up two axes (you should be able to do this in the keymapper). If you want 4 buttons, use joysticktype=4axis. If you want more than 4 buttons, use joysticktype=fcs (or ch, can't remember - the other one supports a point-of-view hat but only 3 axes and 4 buttons in addition to that).

http://img62.imageshack.us/img62/810/dosboxkeymapper.jpg

I made that so this might be a little easier for you to explain to me.

I have no idea what to do. Thanks for help.

read the readme

Ok I found the solution. Simply do not try to configure the controls in DOSbox at all, instead, download a progaram called "Xpadder 5.3" which emualtes your keyboard and mouse through a controller. It gives nearly full control. Works beatifully.