A computer infection does not always announce itself with an obvious warning. Sometimes the first clue is something simple: your laptop feels unusually sluggish, the browser starts behaving strangely, or an application you do not recognize suddenly appears.
The tricky part is that many of these symptoms can also be caused by normal Windows problems.
A nearly full SSD, outdated drivers, excessive startup programs, failing hardware, or a problematic application can produce symptoms that look similar to malware.
That is why the right approach is not to assume that every computer problem is a virus.
Instead, look for several unusual changes happening together and then verify what is actually happening on your system.
Here are nine practical ways to investigate a possible malware infection.
1. Look for Changes You Didn't Make
Start with the simplest question:
What changed recently?
Think about the last few days or weeks.
Did you:
install a new application?
download a file from an unfamiliar website?
install a browser extension?
open an unexpected email attachment?
run a suspicious installer?
notice a new program on your computer?
Unexpected changes are more useful clues than simply noticing that Windows feels slow.
Write down anything unusual before changing or deleting files. This can make troubleshooting much easier.
