Microsoft has released seven patches for several of its software products, including at least two critical updates for known vulnerabilities.
One critical patch is for Microsoft Windows Media Player, as well as four patches for Windows, at least one of which is critical.
Meanwhile, Microsoft has warned of two bugs in its software that could potentially give unauthorised control or access over a person's computer, while a third problem has been highlighted by a security research company.
One vulnerability again affects the Windows Metafile (WMF), which caused problems in December but this time affects fewer users. The bug is in Internet Explorer 5.01 Service Pack 4 on Windows 2000 Service Pack 4 and IE 5.5 Service Pack 2 on Windows Millennium. An attacker could gain control if a user opened a malicious email attachment or if a user were persuaded to visit a website that had a specially crafted WMF image.
A second vulnerability could allow a person with low user privileges to gain higher-level access, while security supplier Secunia has also detailed a third vulnerability, which affects Microsoft's HTML Help Workshop, software that can create online help for a software application or website content.