ping problem

WARNING* You might see me raging a little bit on this post.
okay i believe almost everyone who plays crossfire has had this problem before. You probably will know what my problem is. You guessed it, high ping.
Now if my internet were to be really slow, then okay i would leave it at that, because i already know that slow internet connection leads to higher ping.
Now the problem is that my internet is decently fast. And my ping hits up to 200-400, even 1000 if it gets worse. This started happening since 3 days ago, and it still happens. I logged on just now and found myself looking at my own ping status hitting up at 320ish, sometimes hitting back to 100 (normal for my wireless internet) but like 30 seconds later hitting back up to that same 200-400.
Now dont comment stuff like try re-install/download, gamebooster, virus scan, whatever. Because I've already tried all of them. I'm not stupid.
I've asked all my clan friends, they just said try re-installing, or download the latest version of directX, like I said, i'm not that stupid for not even trying anything then posting this.
Im really pissed about this, because basically when it comes to freetime after doing work, crossfire is all i have. PRACTICALLY. I do have minecraft but it's really boring. I have nothing to do but wait till nighttime and kill some mobs.
Please, can anyone know how to fix this major problem?
BTW, i know this post is really long...im raging quite a bit..but one more thing.. I can connect my laptop to cable internet when i bring it in my living room, but no help. As i've plugged in my cable internet and started crossfire, the same old ping status just hit back. And no i dont think it's the internet's fault, but then it leaves off being my computer's fault. But the weird thing is, my computer is really good. It's only like 1-2 years old. I bought it last summer.