Internet problems! MacBook. I have tried every tip I've found online so far. please help

Internet works fine on all other devices. It does NOT work properly on my MacBook. I get good speed tests (ping:8ms Download Speed: 23.31 Upload speed: 4.95)  and streaming video is fast, but browsing is incredibly slow. When sites eventually load they are faulty and pictures are broken. that's if the the site loads at all. I get all kinds of different results. page not availible ect.
I brought my MacBook to school and then everything worked fine. I can't figure out if it is my network or my MacBook that is the problem.
I have tried:
- using different browsers
- using multiple different DNS adresses
- Changing location
- Renewing DHCP
- Flushcache in terminal
- deleting all knowt networks
- restarting the computer
- changing MTU from 1500 to 1453
- turning off IPv6
altso when I run network diagnostic, IPS, intenet and server shows red, but I'm still conected and streaming videos and stuff. and when I run software update it takes forever and ends up telling me I am not connected to the internet.
Don't assume I know what I'm doing. All the things I've tried comes from tips online. I am an comlpete idiot when it comes to computers and especially internet stuff..
I got MacBook Pro 7.1 (mac OS X version 10.6.8)
please help.

You can try this, double click on your HD  .selecy your home folder>Library>Preferences, locate the file com.apple.NetworkUtility.plist
Drag this to the desktop (which will create a backup) Do not trash
Try loging out, shut down. Then login and try retrying, if no joy you can drag that file back to it's original location (it will ask if you want to replace. click yes)
Then we can try a couple of other things, this is not an uncommom issue, and does not seem  to have a definitive solution that I have yet to to see.
I have however had some sucess by doing a comlpete a reset on the 10.6.8 machine in networkwork utililities (applications/utilities/Networkutility .app and running thru the prompts.

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