Vodafone / HUAWEI K3520 USB modem firmware don't always want to install software automatically when this is inserted for the first time in a computer.

This is a problem I've found on a computer loaded with Windows XP, SP3 (service pack three). After I've tried everything I've found that this happen when the "VGA_Intel_6.14.10.4926_XPx86" drive is installed. To solve this problem just un-install this drive, plug in the Huawei K3520 USB modem / router, install its software after which the mentioned drive could be reloaded again. The "VGA_Intel_6.14.10.4926_XPx86" drive can be download from your computer's manufacturer's website.

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