Hi,
I too had the Black screen problem, All i did in the end (After being told about all kinds of possible problems it wasn't , Like not enough memory or Direct X having to be re-installed), i told my Norton Internet Security (2005) firewall to allow the Swat4 exe file to dial out (On the main window in NIS2005, left click on personal firewall, and the the silver configure button, then the second tab (programs) and select the swat 4 executable and allow always.
This will enable you to run your Norton firewall and Swat 4 together!
Hope it works 4 U!!!