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Unplug any USB Storage devices, Then shut down / Reboot, and try again. (USB Thumb Drives, External USB Hard Drives).
Kali does not like that. ;]

Have you tried adjusting the screen settings in Kali to a larger screen resolution?

I was having problems running linux and windows in vmplayer on kali 1.5 on one of my boxes. So I switched over to a different linux OS on that box. After booting the virtual machine up in Kali and...

That should work. An alternative way to do this would be to open a terminal, type 'leafpad /etc/apt/sources.list' or 'sudo leafpad /etc/apt/sources.list' (if you are a non-root user).
At the top of...

uwnthesis is right. I totally forgot about step's 2-3 because I use OpenVPN most of the time. The step's uwnthesis posted above are a must when using PPTP VPN's in network-manager.

In NetworkManager under your pptp vpn configuration window, check or uncheck/recheck the 'Connect Automatically' and/or 'Available to all users' and then try connecting again to your pptp vpn. Play...

Have you tried to edit the /etc/network/interfaces file and the /etc/NetworkManager/NetworkManager.conf file? Edit /etc/network/interfaces and put a '#' in front of everything except these lines:
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