It's possible that the client may not be compatible with Windows Vista 64-bit. However, before jumping to any conclusions, there are a few things you can try to troubleshoot the issue.

First, make sure that your computer meets the system requirements for the client. Check the do*entation or website of the client to verify this information.

Next, try running the client in compatibility mode. Right-click on the executable file for the client and select "Properties." In the Properties window, go to the "Compatibility" tab and check the box that says "Run this program in compatibility mode for." Then, select "Windows Vista" from the drop-down menu.

If the above steps do not work, you may want to contact the support team for https://forum.r2games.com/forum/browser-games/wartune/beginner-guides-faq-ab/95982-mini-clients-and-you nk19284102409645998="1" style="background-color: rgb(255, 255, 255);">owespeedtest the client and ask if they have any solutions or if the client is indeed not compatible with Windows Vista 64-bit.