Problem Networking Windows Vista to Windows 7 computer


I'm using Windows Vista Home Premium on a 64 bit HP Laptop with 4GB RAM. I'm networked with several other computers. When I try to get to the desktop on my Windows 7 machine from Vista, the Network displays the Windows 7 desktop for an instant and then reverts to the Windows Vista desktop. The problem is new. I've done virus and malware scans.

The procedure I'm using:
I double-click the Network icon on the Vista desktop. In the window that opens I click on my windows 7 icon, enter the appropriate login and password. I then see my Windows 7 shared folders and I click the shared desktop icon to open the Windows 7 desktop in order to transfer files, etc. The Windows 7 desktop opens for an instant and then all the open windows disappear and the Vista desktop reopens.

This problem just started occurring. Any ideas on what's causing the problem and how to fix it?

My Computer