Easy way to check if your computer is/was compromised now or in the past
With the recent addition of Naz.API dataset (a massive collection of over 1 billion stolen username and passwords) to HIBP service ("Have I Been Pwned" - a service by troyhunt.com), it is now very easy to check if your computer is compromised by information stealing malware now or in the past.
Go to the HIBP service at https://haveibeenpwned.com and enter your e-mail (don’t worry, it is 100% safe) and check the search results. The results may span several pages, so make sure to scroll down and check all the breaches your email is listed as compromised. Keep in mind that it is not at all unusual to see your email show up on multiple breaches. For example, see the screenshot below of my own email search.