Signs of Virus/Malware

Hi:-)
I'm just wondering what are the signs of viruses/malware?

Hello Marie,
Each Malware/virus works differently, some are hard to detect and find. They simply start to slow down the computer speed and makes some programs not to work. There are other kind, which will cause unwanted pop-up in your computer. Some other may encrypt your computer files and cause damage to your computer completely. You can click on this link for more information on rootkits http://support.avg.com/SupportArticleView?urlname=What-is-rootkit
Thank you.