So why not simply sign PPJoy with the proper "real" certificates? Simple answer - they cost a lot of money: see http://www.verisign.com/code-signing/content-signing-certificates/microsoft-authenticode/index.html. $500 per year is downright nasty.
If enough people chip in with donations I will release a properly signed version of PPJoy, possibly as "PPJoyPro". I've been toying with the idea of a non-free PPJoyPro with some extra features (suggestions?)
Unfortunately PayPal does not allow South Africans to receive money - only send money through PayPal. Which means I need to find another way to set up a donate button or similar :-(