![]() you probably already rebooted, just fyi: one needs to reboot after removing a filter to test the result You can also check your MTP device for any driver files from other then M$ But let me know if you see any files from other then M$)ģ. file i think will be from Sonic and my own 32bit DVD drivers also includes a UBHelper.sys displayed as "Unknown". Are all the files from Microsoft? (except the Px. Select each driver file and see what company is listed as "Provider". ![]() Do you see any driver file listed with filename starting Px? If not, you may have a registry reference to a non-existent driver fileĢ. ![]() Open Device Manager, right click any DVD drive, select Properties->Driver tab then Driver Details buttonġ. It looks like the PxHlpa64.sys filter can be installed by several different 3rd party products. ignore Device Filters, we only want to look at Class Upper/Lower filters if any on your CD/DVD drive and MTP device)Ĭlick thumbnail for example of Class Upper and Lower Filters on my own computer for my DVD drive Repeat and also report any Class Upper/Lower filters listed for your MTP device. > If you see any filters listed you should be able to copy/paste or report what you see listed in your next post > Scroll through the pull down menu to see both Class Upper Filters and Class Lower Filters ![]() > Open Device Manager, select any one of your DVD drives Let's check to see what filters are installed for both your MTP and CD/DVD device. But if a filter goes bad the whole driver can go bad) iTunes installs filters that may corrupt a driver for use by some non-iTunes devices (Filters are supposed to work with drivers. Here's why: "Filters" are device driver add-on parts. Don't know if this might apply to your case but i've seen reports in other forums about iTunes interfering with the MTP driver, Nokia phones (and Nikon cameras too). ![]()
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