Literally this is it. Either that, or you're a dumbass opening shit in your email that is blatant phishing scams. Working in IT the last 15 years, most of the attack surface has moved from viruses to malware/phishing.
Yeah, thats always a possibility, but literally if you are downloading torrents its like downloading pr0n. You are playing with fire and should know better haha.
Let's put it this way. I would never, and have never, run Windows without a virus checker full time and doing frequent malware scans. I've never run those things on my macs, nor a defragmenter. My computers have not slowed to a crawl after 4 years of use and no fresh OS installs. With my old windows machines, I'd reinstall the OS every so often because the more it got used, the slower the system became. I also never have problems uninstalling software. Just drag the app to the trash and it's gone. I don't have to go hunt for dlls or .ini files it might have left in numerous places in the filesystem.
In 2005 I bought the top of the line MacPro tower. It lasted up until last year and that's only because the new OS wasn't supported any longer. On the flip side, my sister bought a Sony Viao top of the line. After 3 or 4 years, her computer took a shit
Music, video and ebooks are fine. If you are downloading pirated software then you should be very worried about viruses. But that is a concern about any software you illegally download from the internet and not just a problem with torrents.
Running any Microsoft software. You can get a virus just from receiving an email, opening a spreadsheet, etc.
Now you're sounding like jlprk and some of his crazy BS. You can't get a virus from an email, you can get a virus from opening an attachment in an email. There is a difference.