This update resolves the "Heap Overrun in HTR Chunked Encoding Could Enable Web Server Compromise" security vulnerability in Internet Information Server (IIS) 4.0. Download now to prevent a malicious user from running code of his or her choice on your computer.

For more information about this issue, read the associated Microsoft Security Bulletin. (This site is in English.)

1. Click Start and then click Control Panel.
2. Click Add/Remove Programs.
3. Select Windows XP Hotfix (SP1) [See Q321599 for more information], and then click Add/Remove.