My advice would be to download malware bytes from here : https://www.malwarebytes.com/
runs a full scan - make sure to go into the options of the scan and check the box that says "Scan for rootkit"
Once you have finished the scan if there is nothing showing its time to do a boot time scan with AV.
I like kaspersky antivirus the trial can be had here : https://www.kaspersky.co.uk/downloads
Make sure you update the AV and run a full boot time scan with it..
If still nothing is showing then you possibly have a "bad Bios" rootkit somewhere.
Always keep you wallet ID safe. I never advice keeping it on your machine I keep mine in encrypted SD cards that I use only with once PC that dose nothing but hold my coins. that way I can rest asure I would be picking up anything nasty online and it get my wallets files or my wallet keys. Your seed also should be protected.. I know my seed is normally 12 words.. I add words in that only I know are the wrong words so even if someone did get my seed they would struggle to pull the legit seed out as there are additional words added random locations.
by the way thanks for the advice .