Long Boot Time and BSOD from Non-Existent Device

I have an issue with my wife's HP Pavilion Slimline s3330f computer running Windows 7 Home Premium 32-bit.

Recently, the boot times have been in excess of five minutes and on shutdown there is an occasional and seemingly random BSOD. The BSOD error message includes a reference to xcfev.sys - Address 8F1510A0 base at 8F150000; DateStamp 48Ce158e. This is preceded in the error message by STOP: 0x0000007E (0xC0000005, 0x8F1510A0, 0x8B276BCC, 0x8B276780). The xcfev.sys file is 593 KB in size and resides in:

C:\Windows\System32\DriverStore\FileRepository\xcbdav.inf_x86_neutral_8e8664e62708b91f , and in:

C:\WINDOWS\winsxs\x86_xcbdav.inf_31bf3856ad364e35_6.1.7600.16385_none_23239678b7db5032\.

Apparently xcfev.sys is a ViXS XCode AVStream Driver Front-End Library sold by ViXS Systems Inc.

In addition, under Sound, video and game controllers in Device Manager there is a listing for VIXS Pure TV-U 48A3, which I believe is a TV tuner and which is indicated as working properly.

However, there is no TV tuner on the system, nor has there ever been, and I have never seen the device previously in Device Manager.

I suspect the long boot time may be the result of the system looking for a device that isn't there and the BSOD may be the result of the system trying to unload the same.

Thanks in advance for any help you can provide to eliminate this problem.