I have the same problem with the same version of maya. Reinstalling maya fixes the problem once, but when I close the program and open it again the main window doesn't open again untill I reinstall the program again. I can open the main window by using the "showWindow" command in the script editor window, but the main window doesnt have most of the stuff I need there (eg the 3d window or the "file edit tools help" bar)

PC specs:
Windows xp pro sp2
Radeon 2900 XT 512mb
Core 2 duo e6750 2.66ghz
4gb ddr800 (3.5 available cos I'm too lazy to get 64bit)
gigabyte GA-P35-DS3R mobo