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http://www.nirsoft.net/
One of them is USBDeview:
http://www.nirsoft.net/utils/usb_devices_view.html
You have to scroll to the bottom of the page to find the download links...and note that there are separate ones for 32-bit and 64-bit. It works in XP and W7 (and 2K, Vista, W8, and some others).
It is a stand-alone/no-install executable...simply run the EXE file that is in the downloaded ZIP file. It has a command line interface with "enable" and "disable" options. So use whatever your favorite scripting language is (or just a simple batch file) and call <USBDeview.exe> with the "enable" option, then pause/sleep/wait for 120 seconds, then call <USBDeview.exe> with the "disable" option, then pause/sleep/wait for 30 seconds, then loop back...run the loop as many times as you want. Regards, Joe