serial ports / windows crashes with arduino pluged

since i did not do anything usefull with arduino during the last months i tried to have some fun recently. but i discovered that arduino gets a very high comport number (com55). and every single other port (from 1 to 54) is shown to be in use. the most interesting thing is, that only port 1 and 30-40 are shown in the system configurations. where are the other ports? without seeing them i can't deactivate them. is there any hint how to get a lower portnumber for arduino?

edit: when i try to change any configuration of the comports, the computer crashes with a wonderfull bluescreen. edit#2: trying a different usb port causes randomly crashes too.

wow. seems like something has messed up my windows. :)