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Usually it's best to consult manufacturer's info on your computer. If not available, you can check it by going to start menu>settings>control panel>system>device manager and then look for "universal serial bus controllers" - several devices should be visible here and if you have USB2 it will be clearly stated (e.g. something along the lines of "USB2 Enhanced Host Controller"). Generally I would say if your computer is less than 4-5 years old, it will probably have USB2. Hope this helps, Raf
method 1: buy a power adapter that has a switch controlled output voltage - they usually have 3V - 4.5V - 6V - 7.5V - 9V and 12V selectable output. Start with 6V and if its not working unplug, select 9 and try again etc. etc.
method 2: open the case and locate an electrolytic capacitor right near the power plug - the biggest one. Note the voltage (for example it may say: 1000uF/15V) and have in mind that your device MUST work at a LOWER level that this.
do one thing boot ur vista without usb hub then go to device manager remove your usb drivers of the hub disconnect the hub from computer, restart notebook, then connect the hub back when windows boot let vista to install the driver of that hub, after that connect your devices one by one ok let me know what happen? :-)