How to know if computer is hacked into?

We’ve reason to trust my web connection is not secure.We’ve a cable connection modem along with called for you to cable co asking concerning security.They said We’ve a secure connection.We’ve the FireWall, AntiSpy, and so forth…but include concerns.Could the actual modem always be bugged How to know more without compensating a pro

The earliest knowledge maybe you have is the actual sudden reduction of the financial accounts from the healthy balance with a nasty debts.Or obtaining something only to find someone different has already sent applications for it while you.