Hi John,
This generally has to do with display drivers. If you have recently updated
them or ran the MS updates to do so, try a rollback via the Device Manager.
Create a system restore point first. If this is not the case, use
Ctrl/Alt/Delete and end process on Explorer.exe if it is listed and either
way, then go to File/New Task (Run) and type in: Explorer.exe.
Other options/suggestions:
Restore Taskbar and Desktop to Default Functionality (Line 164)
http://www.kellys-korner-xp.com/xp_tweaks.htm
To use the VBS Files: Download .vbs file and save it to your hard drive (you
may want to right click and use Save Target As). Double click the vbs
file. You will be prompted when the script is done.
NOTE: If your anti-virus software warns you of a "malicious" script, this
is normal if you have "Script Safe" or similar technology enabled. These
scripts are not malicious, but they do make changes to the System Registry.
Added info and help:
Taskbar Repair Tool Plus!
http://www.kellys-korner-xp.com/taskbarplus!.htm
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All the Best,
Kelly (MS-MVP/DTS&XP)
Taskbar Repair Tool
http://www.kellys-korner-xp.com/taskbarplus!.htm