Do you know what you're talking about?
Ofcourse, if you don't know what the hell you're downloading, you'd get malware.
A Mac is literally a PC but just a different operating system. Your argument is invalid because you're basically saying Mac and PC sucks.
You can get up to 192GB of RAM if you build yourself a custom computer.
Not saying anything bad about macs because I myself love macbooks but I don't think you know what you're saying.
Honestly, this PC you're buying isn't bad if you don't have time or just don't want to build a computer.
You'd get a Core i5 (which is good), 1024 GB of space (You can buy external hard drives for more space). 12-16GB of RAM (didn't read clearly), and a decent graphics card (GTX 730, not the best but it's better than most).