USB wireless adapter causing problem in computer’s performance

As of the moment, my computer running on Windows XP keeps on crashing. My old computer is connected with a USB wireless adapter for accessing the internet. I do my usual routine of start up and wait for the display in the desktop. For a few seconds after booting my computer, I can hear a repeatedly click sound. And suddenly the monitor screen just goes blank. But my mouse pointer is still alive because it can be seen whenever I move it to the upper left of my screen. Upon investigation, I remove the USB Wireless adapter and it works back to normal. What is wrong with my USB wireless adapter? Where is the problem?
