please somone help me!

i recently downloaded a file from the internet... once opened norton instantly informed me of trojans but i could only heal one of them. (out of two) i cant remember what they were called but.. it was somthing like trojan.cm.generic... ever since then somthing has been sending my internet connection tons of "inbound udp or ucp packets" norton is blocking as many as it can but please if anyone has a permanant solution to this i would be really really grate full. 

 

thanks for your time :)