You may be unable to install the Cisco virtual private network (VPN)
client on your Windows XP-based computer.
This problem may occur because the Cisco VPN clients version 3.1 and 3.5 are not completely compatible with Windows XP. Note that you may be able to obtain an updated .inf file that makes it possible to correctly install the Cisco VPN client version 3.5.
To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the
Microsoft Knowledge Base:
How to Obtain the Latest Windows XP Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows XP Service Pack 1.
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.