getting hacked again with new hardware

I didn't have any security measures on my previous notebook there was just deepfreeze. It is possible someone was monitoring my activities.

Now i have a new notebook.I dont want to change my cable internet provider but I plan to use a new modem with this notebook.So I have a new pc and modem but old ISP. if someone hacked me before can this person find and hack me again? If so how can I protect myself?

via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/509315/getting-hacked-again-with-new-hardware/