Windows 7 users who are in UK or New Zealand are affected by a recent flaw about broadcast guide schedule in Windows Media Center (WMC). The software crashes if some in-band data contains Content Reference Identifiers (CRID) which is designed for scheduled events. Therefore, UK users who are using PVR may exeperience problems.

The fix is available for both 32-bit and 64-bit versions of Windows 7. It is not available via Windows Update so users need to download it at the Microsoft Download Center.

Source: Ars Technica