http://www.kbalertz.com/kb_878485.aspx

MS KB Article #878485

SYMPTOMS
You may not be able to start version 2.52 of the Sharman Networks Kazaa program on a computer that is running Microsoft Windows XP with Service Pack 2 (SP2). However, the Kazaa program icon may appear in the notification area. Additionally, if you move the pointer over the Kazaa program icon in the notification area, the icon may disappear.
RESOLUTION
To resolve this issue, contact Sharman Networks for information about updates and new versions that may be available for the Kazaa program. For more information about Sharman Networks products and support services, visit the following Sharman Networks Web site:
http://www.sharmannetworks.com/

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
MORE INFORMATION
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.