[ttecht]

i have to share some files with people from my office (transfer files from office pc to home pc by usb).i dont have any antivirus software installed on my pc.it occured to me someone from my office may have attached a virus to office files and monitoring my pc activities.I dont have any reason to believe so but just in case i will buy a new pc (since to my knowledge even formatting and antiviruses cant find some viruses) and use my old pc for office work.I have some questions

1should i change my modem too in case someone is already tracking me and can continue tracking me using my modem even if i change my pc

2should i change my internet membership in case someone can continue tracking me using my membership data

3if someone is tracking me is there any other way they can continue tracking me after i changed my pc

i am using cable internet

thanks