Yep, you need native 64-bit drivers actually, right now, it looks like it is not supported. You should contact 3COM about support for Vista x64. I would file a driver request in the mean time using the following links: For Feedback: [URL]http://go.microsoft.com/fwlink/?linkid=55160[/URL] Feedback reporting tool: [URL]http://go.microsoft.com/fwlink/?linkid=43655[/URL] Tips for how to file a problem report Here are some things to consider when filing a problem report: Please file your report as soon as possible after you find a problem. The sooner we hear from you, the sooner we can investigate and try to fix the problem. Please provide a brief, descriptive title. The title is the first thing we see when we get the report, so a succinct, clear title will help us effectively identify and prioritize the problem. Please provide enough detail in the description for us to understand the problem. The more detail you can provide, the better. Please provide the steps we can follow to reproduce the problem. Any incorrect or missing steps can prevent us from being able to reproduce and address the problem. If you have any supplemental files, screen shots, etc., that will help us investigate the problem, please attach those to your report. Seeing a picture can sometimes help us identify the problem more quickly.