I am new to all of this so may not express the problem too well, however....
My PC(Dell Dimension 2400, running Windows XP SP2) has stopped recognising any USB devices. I have tried connecting an iPhone, an external hard drive, a flash drive and a digital camera.
I've read a few forums and after trying a few things have noticed that there is an Unknown Device shown in Device Manager. On looking further I found that it is USB\ROOT_HUB20 so I thought this may be the problem. I have tried deleting and restarting but it simply re-appears as unknown device.
Can anyone help and is the possibly the cause of my problem with the above devices ?