Microsoft said on Thursday that it is planning an update to Windows 7 that will close a number of loopholes that counterfeiters had used to thwart the operating system's built-in antipiracy measures.

The Windows Activation Technologies Update for Windows 7, which will be released later this month, closes more than 70 "activation hacks," according to Joe Williams, general manager of Microsoft's Genuine Windows unit, responsible for anti-counterfeiting measures. The update will also check with a server periodically to see if there are further hacks that need to be addressed, though Williams said no personally identifiable information about the user will be sent to the server.

In an interview, Williams cautioned about the dangers that come with using nongenuine versions of the operating system, citing a German study that looked at several hundred copies of Windows 7 that were posted online and found that nearly a third had some type of malware.

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