Extra program button showing on the taskbar?

[Guest]

About 2-3 times in 1 hour a program button will show up in the taskbar. No
program starts or no window opens. It doesn't do anything when I click on
it, single, double or right click. It's a white outlined bar with a small
square white outlined on the left hand side. It doesn't have any writing on
it and when it shows it just appears and then dissappears.

 

[Malke]

About 2-3 times in 1 hour a program button will show up in the
taskbar. No
program starts or no window opens. It doesn't do anything when I
click on
it, single, double or right click. It's a white outlined bar with a
small
square white outlined on the left hand side. It doesn't have any
writing on it and when it shows it just appears and then dissappears.

First, make sure the computer is completely free of viruses and malware:
http://www.elephantboycomputers.com/page2.html#Removing_Malware

After you are sure the computer is 100% clean if the problem persists,
do clean-boot troubleshooting:

Clean boot in Windows XP - http://support.microsoft.com/kb/310353
Clean-boot advanced troubleshooting in Windows XP -
http://support.microsoft.com/kb/316434
and How to Troubleshoot By Using the Msconfig Utility in Windows XP -
http://support.microsoft.com/?id=310560

Malke