Loopholes in Word, Excel, PowerPoint, Internet Explorer and Microsoft's Malware Protection Engine are rendered safe by the new package and versions of these programs used on Windows 2000 and XP could also have these loopholes.
There is vulnerability in the Microsoft program to find viruses and spyware on infected computers and the new package has the fix for this risk.
Windows users who are concerned that their PCs might be in danger are urged to check the details about which programs are vulnerable on Microsoft's security site.
None of the patches apply to Vista, which is the latest version of the Windows operating system recently released on 30 January.
