Internet suddenly very slow , latency going high and dropping low in a loop?

[Said]

My internet sometimes goes very slow and then after few minutes it goes to normal, it's like a loop that occurs over and over again . i have tried few things to see if it would affect my internet speed .
i have tried to i cleaned my modem, restarted it several times.
used ipconfig /flushdns in cmd
scanned my whole computer 3times without finding any viruses with Webroot SecureAnywhere
i used ccleaner to clean 10gb's of garbage
i have 3pc's with 2 of them wireless connected, did a speed test on the second wireless connected pc and has pretty much same speed and the one connected with a wire had 30mb/s and latency of 10 the whole time.

here are some screenshots:
---
this is when my ping is okey but not the best
http://img543.imageshack.us/img543/5344/5qvz.png

here you can see the clear loop of my latency going up for few minutes and going down to normal
http://img801.imageshack.us/img801/8364/ixby.png

my system
http://img43.imageshack.us/img43/49/rg2q.png

in counter strike global offensive when my ping goes very high for atleast one whole round(5minutes)
http://img547.imageshack.us/img547/2723/9gc5.png

and here it's low again and im owning some people.
http://img838.imageshack.us/img838/2194/76eb.png


i hope i gave enough information and that a kind sir can help me out here, it makes gaming unbearable and watching video's on youtube has pretty much the same problem.
thank you in advance.

[Zarn]

Reinstall the driver of the wifi card. Also, try scanning with Malwarebytes' Anti-Malware, http://www.malwarebytes.org . You might also want to check the manufacturer's website for a newer wifi driver. Uninstall Hamachi or anything else that starts messing with your routing through the wifi.

[VISHWAPRIYA]

Speak to the Service provider.

[Admin/Tech]

Drivers
Back ground programs using CPU & memory
Dirty fan & heat-sink on processor
Failed video card fan
Power supply voltage low

[Josh]

neat! I was handed a PSN card code and it wasn't invalid! If you want one go to http://psn.cardcodes.net