As far as I can see the answer is yes, the PCI-4060 can still be repaired. You'll want to contact Customer Service (ni.com/contact) to make sure and to set up the repair. Are you seeing a particular problem that might be addressed on this forum?
The software is NI-DMM for all NI DMMs. One way to check compatibility is to go to the drivers & updates page (ni.com/updates) and search for "DMM". The latest version should be on top and when you click on it to go to its page, you should look in the readme for specifics. I recommend finding (Ctrl+F) all instances of "4060" and/or "4065" to read about any differences, as there are some (such as Vista support, naming, triggering, etc.).
I hope that helps.
Mark E.
Precision DC Product Support Engineer
National Instruments