I use both desktop PC and Dell notebook with Windows for years. If you want to keep your Windows OS safe just buy a antivirus program, which I use Norton, formally Kaspersky both of them are good. And I never format or repair my Windows PCs since. Even I bought a cheap Lenovo notebook for my parents and they use it for 5-6 years now and I didn’t format their PCs since. Only for new Windows installs thats all. Also don’t use cracked software. It can harm and slower your PC. The money you will spend for an iMac with GPU you can create an incredible Windows PC setup. I use Mac-mini(i5 Dual Core, 256GB SSD, 16GB Ram) for app development for iOS but Unreal didn’t work on it. So, you need a Mac with GPU and at least quad-core i7 CPU. But people who want to develop games with Unreal I suggest a Windows PC.