HTC has issued an update that fixes a Bluetooth vulnerability in the HTC Touch HD, Touch Diamond and Touch Pro. The problem was in the Bluetooth driver, obexfile.dll, and found in HTC Windows mobile phones.
Until you download the fix you work-around the bug by not using Bluetooth at all.
The Bluetooth patch shoud block the Bluetooth hackers form HTC
WinMo handset's file-system. Once hackers can get into the system they can basically do whatever they want without your permission.
The patch is found at the HTC website, be sure download the correct patch for your HTC Windows phone.