|The USB controllers must be enabled in the computer's bios Setup.|
All Windows operating systems Win 98 and up have USB 1.x drivers built into them and they are installed automatically - so your USB ports always have at least USB 1.x support, if they're enabled in the bios.
If the mboard's hardware, or a USB controller card installed in a mboard slot, supports USB 2.0 specs.....
- Windows XP must have SP1 or later updates installed in it in order to support USB 2.0 controllers
- the main chipset drivers for the mboard MUST be installed in order for XP to actually install it's built in USB 2.0 support
Wireless mice and wireless keyboards usually do not require any special drivers in order for them to have their standard basic functions. They only need special software for their enhanced functions,and that's completely optional.
The battery(ies) in the mouse or keyboard must have enough charge.
Some wireless mice have switch that turns them off to conserve battery power.
Older mice may have a tiny physical switch - newer ones may require that you press the right or left button on the top to switch them on.
Newer than, say, five year old, wireless mice and keyboard models will usually work fine shortly after the USB transmitter/ receiver has been plugged in and recognized by Windows.
Neither may work the first time if the USB transmitter/ receiver has never been plugged in for the same Windows installation, until the desktop screen has fully loaded and the generic drivers for the USB transmitter/ receiver have been installed.
You will not be able to the move the wireless mouse's cursor the first time if it's your only mouse, until the desktop screen has fully loaded and the generic drivers for the mouse have been installed - in that case, if you need to Logon while booting, either have another USB or PS/2 or Serial mouse connected, or use the Tab key to toggle which thing on the screen is active (fine dots around it), and the cursor keys and Enter to select an item or choose it.