Windows 7: IVT Bluetooth problem

Hi everyone,

After installimg Windows 7 7100 every driver was pre-installed and worked well, that includes my IVT BT usb dodge ...

However, suddenly it was not working anymore, so I had to install the driver v6.4.249 ...

Now, it works well, but explorer hangs may be due to compitability ... and my divice manager shows an error ... any help what could that be ???