My basic optical mouse V2.0 stopped working

Hi,

References to Vista also apply to Windows 7.

Do these to clear corruption and repair/replace damaged/missing system files.

Start - type in Search box -  COMMAND   find at top of list -  RIGHT CLICK  -  RUN AS ADMIN

sfc /scannow

How to Repair Windows 7 System Files with System File Checker
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Then run checkdisk (chkdsk).

How to Run Disk Check in Windows 7
http://www.sevenforums.com/tutorials/433-disk-check.html

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Then lets refresh the USB Stack.

Control Panel - Device Manager - click anywhere in the blank/white area - then VIEW - Show
Disabled Devices - look everywhere (except USB Controllers) for your MOUSE (may have
none or more than one) and Right Click on it - UNINSTALL.

Control Panel - Device Manager - USB Serial Controllers - RIGHT CLICK on EVERYTHING and
UNINSTALL all except the category itself - REBOOT - this refreshes the driver and the USB stack

This KB shows the XP how to and the Vista and Windows 7 methods are identical
http://support.microsoft.com/kb/310575

Here is a utility to help but do the above 1st.

USBDeview is a small utility that lists all USB devices that currently connected to your computer,
as well as all USB devices that you previously used. Run it Options and check the 1st three
choices to see if any are there.

http://www.nirsoft.net/utils/usb_devices_view.html

You would remove all instances of the devices then reboot.

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If needed try both of these :

Tips for solving problems with USB devices - and a Mr Fixit
http://windowshelp.microsoft.com/Windows/en-US/Help/c39bd203-f729-47a4-8351-83291e13c8a81033.mspx#EGB

Hardware devices not detected or not working - Mr Fixit
http://support.microsoft.com/gp/hardware_device_problems

Hope this helps.