my computer works fine when i am not connected to the internet. as soon as i connect to the internet and open my browser my computer will start to slow way down and then freeze. when i disconnect from the internet its still slow and i will have to restart. the only thing that i have seen different is ask toolbar on internet explorer so i deleted it but the problem still occurs. i ran avast antivirus, adware 2008 and malwarebytes and all have came up zero infections. i do not know what else to do any help is appreciated.

I found the problem. i had two dvds saved on my hardrive and when i deleted them my computer started working just fine. im not sure why that made a difference it never has done that before. thanks for your suggestions mike.

The start button is also slower then normal.

Is this a laptop or a desktop?
Try installing and running Defraggler:
http://www.defraggler.com/
Also try installing CCleaner, and on the "issues" tab, run a scan and repair all issues, then run again and repair until they are all gone.
http://www.ccleaner.com

When i connect to the internet my computer will run fine for about ten minutes then it will start to slow way done and eventually freeze. Its not just the browser but the entire system. I Have ran defraggler and ccleaner on top of windows defender, avast antivirus, adware 2008, and malwarebytes. all have came with nothing. when i am not connected to the internet my comp. will run just fine. its only while im connected and after i disconnect its slow until i restart. please help.

When the browser is opened, is it just the browser that is slow or if you press the start button, is that also slower than normal opening?