The other option is downloading kaspersky total or bitdefender and scanning the machine to see what it finds and then remove those threats. And maybe continue using it?
Have less trust in anti-viruses. If your machine has caught anything, then for whatever “cleaning” program you install, you'll never be sure you're safe; I'd say not even convinced.
What kind of files are those you want to export? Are they just videos, images and wallet.dat kind of files? If that's the case, then just transfer them in a USB, wipe up the drive and re-install your OS. If there are closed-sourced executables included, then I advice against.
The big issue here is I have seed stored in my password manager, so if I open it up, if keylogger there, then I'm screwed?
If we assume you copy it, then yeah. Keylogger will detect it. Note that there are screen recording kind of malwares, so just having the seed phrase on-screen on a virus-affected machine is neither safe.
I know we sound fearmongering, but it's the way computers and bitcoin work that makes us,
completely justifiably, do.