Loss of keyboard and mouse Desktop 6/Mac OS 10/Vista config

Using Desktop 6, with new Macbook running OS 10. Migrated Vista 7 64 bit from an HP laptop. Successful (as near as I could tell) migration. Had to get new product for Vista. Got it up and running. Then after Vista compressed its files the VM mouse and keyboard no longer work. I open VM, click on Vista it starts and runs, it is connected to the internet, there are all sorts of VM messages waiting to be responded to. I have reinstalled parallels tools a number of times. The Mac arrow and keyboard operate as per usual. I can see the arrow on the VM smack in the middle. Whenever I click it, it stops the Mac one, as it should, but the VM arrow/mouse does not function.

What can I do???