Downloading rates dropping

Hi guys i just want to ask some of you people that are good in computers.
I got a dell Xps 15 like a week ago.
When i tryed downloading WoW on it the downloading rates would go to about 900kbs and then slowly drop it less then one, and the cycle kept going.
Also im trying to download starcraft and im not getting the same 900kbs that i got on WoW,im only getting 200-300kbs.

Is this because of my computer or my internet ?
Sorry that im a computer noob
Thanks in advance
-omegarocks
 
who is your ISP? frequently they will apply a QoS to specific ports to preserve bandwidth for other users - - -
 
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