KrisCZ,
Your player seems to have a 1.8inch LCD 160x128. You need to convert your amv videos to 160x120 resolution. To do this you need to use version 4.0 or version 3.57.
Although 4.03, 4.05, 4.07 have a setting for 160x120 they actually encode to 176x128 which is to large for your player to run. These versions were released for players with 2.0 inch plus screens.
If you use version 3.57 then you need to change the settings manually. There is a post on how to do that here:
http://www.mympxplayer.org/full-scre...or--vt449.html