Right first of all Curious what you have told me about your patch is its Pie which has 0 blocking or filtering abiltiy so that means that its likely a simple problem of fake files. I wont say most fakes are of movie or tv shows there are plenty listed as mp3 and even karaoke files however, your much more likely to run across fake video files then mp3.
Now that all said there is a easy cure.
Go to this page:
https://patch.winmxconex.com/Download the first option 'Set Up For Existing Installs of WinMX'
Save this to the computer, when its finished run this. It will remove the Pie patch and it will install the modified dll patch that has both blocking and filtering.
Next upon restart of WinMX I need you to go to your incomplete files on the transfer screen and
Delete anything you have 0 bytes of or 0% as they are also likely fakes.
After all that go ahead and do some searching for files, you may very well see fewer results but all results you DO have will be real with the chance of actually getting one.
Fake files are put on the network via the RIAA companies and almost never download they almost always report as available but turn red. After you have done this come back here and with your AVG and the like turned back on try some searching and downloading.
Let us know how that goes.