Microsoft released its monthly Windows patches today, and one of them is considered of critical importance. There is a flaw in the TCP/IP processing in Windows 2000, XP (with Service Pack 2), Server 2003 and Vista that could result in a user's computer being taken over. The other patch involves Windows' Local Security Authority Subsystem Service (LSASS), and could also result in an attacker being able to control an unpatched computer; this threat is rated as important.