First two things broken by the upgrade to Windows 7 from Vista 64 BIT.
1) Windows Yammer client – removing and reinstalling for that
2) Vmware vsphere client and the well known windows 7 issues with earlier clients here
Did some checking and the latest client 4.0.0 build 208111 from www.vmware.com will solve the problem without resorting to the changes which previously allowed workaround.
Works a treat on 64 BIT
For specifics on the issues with the Vsphere client and windows 7 see VMWARE KB INFO