Sony PEG-TG50 - Manual (Page 26)

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Check that the USB port of your computer is enabled
If you are using a Windows 95 pre-installed computer or other older type of
computer equipped with a USB port, the USB port may be disabled by default.
If you cannot use a different device, such as a USB mouse, check the BIOS
setting of your computer.
In addition, check the setting in the Device Manager. Right-click My
Computer and select Properties from the menu. (If you are using Windows
2000 Professional/Windows XP, click the Hardware tab.) Click the Device
Manager tab and check that “USB controller” is displayed in the Device
Manager screen.
If “USB controller” is not displayed
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For details, refer to the manual of your computer.