i think i am being hacked

hi, first i am a novice so i plead total ignorance.
i have recently bought a 2nd hand computer and logged onto the net, for a while it was fine but then it started.
my prob: when i dial up using my wireless connection i noticed the blue monitors going off in the connection status. without (me) surfing at all or opening my browser - over an hour it seems like 8-10 MBs has been transfered. i have turned off windows update i have zone alarm but its obvious when thats updating. when i installed kaspersky antihacker and looked at the connections being made i found various remote addresses, going on and off. (without me opening my mozilla)
i figured out how to block the packets with kaspersky, (i think) but then the remote addres would change, i would then block another, and this would continue for e.g 2 hours, and i am tired.
here is a list of some of the ip addresses i tried to block, - however for some reason after blocking these i could no longer surf , so i reverted to ZA and closed kaspersky.

207.46.13.30
62.236.48.222
81.52.132.15
10.0.65.112
10.0.64.251
10.0.66.59
60.254.131.43
60.254.131.41
213.244.181.63
212.73.231.106 / 113
71.34.10.195
81.52.205.8
212.187.169.252
10.0.66.247

am i being hacked, or what is happening, cos all i have done is look at majorgeeks and 5MB has been received this time round
how do i stop it, and it is also slowing down my surfing

thanks

 

Welcome to MajorGeeks.com, please follow the steps below:

- Run ALL the steps in this Sticky thread READ & RUN ME FIRST Before Asking for Support

• Make sure you check version numbers and get all updates.

After doing ALL of the above you still have a problem make sure you have booted to normal mode and run the steps in the below link to properly use HijackThis:

Downloading, Installing, and Running HijackThis

When you return to make your next post, make sure you attach the following logs and that you have run these scans in the following order too (these scans are covered in steps 6 & 7 of the READ & RUN ME sticky)

• Bitdefender
• Panda Scan
• HijackThis