You will not be able to install AV on your computer when you run a Live CD.
But there are free Live CDs produced by anti-virus companies that include their AV product.
6 years ago, I made a video for the F-Secure Live CD. This gives you an idea how it works:
But be careful before you do this. If the AV finds malware in your data files, you run the risk that it deletes the files without recovery option.
Opening the files to copy the content is risky, you might active the malware by opening the files if they are infected. And then it can infect your new data files or your removable disk connected to the PC.
But you could copy the content to a text file (notepad)
I think the best thing you can do is the following:
1) boot from a Live CD
2) review the creation and modification dates of all your data files on the harddisk
3) if they predate the infection, then they are probably clean,
4) copy your data files to a USB stick.
5) remove the USB stick, don't plug it in another computer
6) boot from a Live CD from a AV company, and scan the harddisks.
If you didn't find data files dating from the infection, and the AV didn't find anything, then you are PROBABLY safe. Then you can use the files you copied on the USB stick.
But realize that there is no 100% guarantee. The malware might also have tampered with the timestamps, and the AV might miss malware, especially if you didn't manage to use the latest AV signatures.
Also be careful with AV Live CDs. They can delete infected files and render your computer unbootable.
I build my own Windows Live CD with the Ultimate Boot CD, so I haven't used Linux Live CDs in a while.
Here is a list of Live CDs:
If I would choose one, I'd select Hiren's Boot CD, because of its history
Edited by Didier Stevens, 04 August 2014 - 10:24 AM.
SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.
Stevens' law: "As an online security discussion grows longer, the probability of a reference to BadUSB approaches 1.0"