Rishlust
You have not provided us with enough information, just saying some one has hacked you most if not all people on this forum will look at you and just walk away laughing, you have provided no proof and very little information as to what's happening!
Firstly, from what you have said (and it is very hard to read between all the babble) you are recording Pings via IGMP and multicast, this is not some one spying on you but most likely your ISP pinging your router to make sure the connection is live!
Secondly, TURN OFF system restore, then you need to virus scan you system when it is completely disconnected from the router (no wifi no cable) also download Hijackthis and run it please copy and paste the log file here so we can see if there are any dodgy processes running. Also run CCleaner and give your system a good clean out (do not run the registry clean though as this can cause its own problems).
Once you have done all this and posted the log file from Hijackthis there is just a small possibility we can help you!
We the forums users that have been here for years take quite a bit of pride in helping people like yourself and will do all we can, but we will need information from you as we cannot see your system with our own eyes!