Microsoft has responded to pirates by blacklisting the Lenovo OEM key that leaked earlier this week.

On Tuesday Neowin reported that pirates were able to modify their BIOS and activate copies of Windows 7 Ultimate with a Lenovo OEM master key. Microsoft have worked with Lenovo to blacklist the master key before Windows 7 starts shipping with new PCs in October.

According to Alex Kochis, Director of Genuine Windows at Microsoft: "we've worked with that manufacturer so that customers who purchase genuine copies of Windows 7 from this manufacturer will experience no issues validating their copy of Windows 7. At the same time we will seek to alert customers who are using the leaked key that they are running a non-genuine copy of Windows. It's important to note that no PCs will be sold that will use this key."