Can I install Bitdefender using a thumb drive


My MIL mistakenly gave hackers overnight remote access to her computer. It had BitDefender installed. I have disconnected the computer from the internet, but I am not sure that the hackers did anything to the BitDefender software. I'd like to remove the software and reinstall a new copy from a thumb drive (avoiding the internet until I scan the computer with a new version of BitDefender). Is this possible? Thanks for your help!