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I have the same problem :( Just upgraded to 5584, and Kaspersky came up saying it wasn't registered. Uninstall/reinstall via Actions menu hasn't...
I've been running both ubuntu 6.06 and 6.10 on my macbook (1GB ram) with no probs at all.... Installed off the live cd, using the 'other linux...
VMWare allows this - the ability to not save any changes to the image. Not too sure how they do it - think they store the disk changes seperatley...