HyBriDo wrote:1.If i run Minecraft Classic from the Website it works.
2.WoM-Client worked before on the same computer
3.My OS is Windows 7 Home Premium x64
Hey HyBriDo, I'm quite sure there are two important factors causing this to happen.
First of all as dzienny has pointed out, the jar may not be compatible with 64-bit...
[.COM files incompatible with 64-bit Windows] ~Wikipedia
Second, generally .bat files don't work great on 64-bit computers. The process usually takes longer also.
Could you try downloading the file below, and run it from the same directory where wom.bat is?