I find it highly unlikely you're specifically being targeted by cyber criminals (most common is mass email spam/phishing, drive by malware in sites for ransomware or botnet purposes).
It's much more likely you have failing hardware such as the disk, memory or a heating problem. You should be able to get some tools to test from another computer. I would recommend hiren boot disc. Throw it on a USB and run memtest86+ for at least 5-10 passes and a hard drive fitness test such as Seagate SeaTools.