Unfortunately at this time VMware does not support the vSphere client or vCenter on Windows 7 or Server 2008 R2. If you try and launch the client you will get:
Error parsing the server “SERVER IP” “clients.xml” file. Login will continue, contact your system administrator
There are many threads over on the VMware communities about this problem, and there’s a workaround which I’ve been successfully using. But more recently a member wrote a powershell script which automates the ‘hack’.
Check out this blog post to download the script. I have no idea when VMware will release an update to fix the problem, but I hope its soon. I would guess it will come with official support for Windows 7 and Server 2008 R2. Since MS will officially launch them next month, I would guess official support is not too far off into the future.