My internet is getting DDoS attacked and Net spam all the time, need help!


DDoS: *Somtimes when i play my internet just disconnect, i dont understand why.
It happens very often and I've called our network host and they said we would try the Anti-DDoS programs, I've searched but no one seems to work and most of them are uploaded in MegaUpload who have laid down.
I sake appreciate if someone could give me tips / application that can keep me from being at DDoS Attacked.

Net Spam
: *I'm not sure many have heard this but it happens to me, sometimes I get attacked by this net Spam and this is how it works: I start to lag and I get high pings in games / movies loads slow. Then you will see my whole desk full of. DLL files and 10 seconds later it will be my internet canceled and will not work for a few minutes.
I would like some help with this too: (
Thanks