Internet pages sometimes load very slow/ not at all. not browser specific

[MrMeep]

Hi.

Since this afternoon my computer's internet has been acting strange.
Up untill somewhere this afternoon, browsing the web with Google Chrome went nice and fast. However, sometime in the afternoon, some pages just wouldn't load (mainly anything but my homepage/google search). I tried using Internet Explorer, to see if it was a Chrome problem, but IE was even slower than usual and also failed to load pages.
My computer is connected by a LAN cable and has no wireless availability.
I scanned for malware, found a few things, cleaned up, but it had no effect.
Reinstalled Chrome; no effect (no surprise).
Removed all extensions from Chrome; no effect.
Rebooted pc; no effect
Rebooted router: Temporary fix, problem returned after some time (<3hr)
I doubt that it's router related, since my laptop works perfectly fine (though wireless).
Tried DNSflush in command prompt; no effect

Also:
Sometimes the problem seems to be gone, but returns after a while.
Running Chrome with Adblock Plus

Sooo.... I have no idea what else to do, searched the internet for answers on my laptop, but nothing so far seems to have helped... anyone here know what to do?
thanks in advance.

 

[evims]

Have you tried using another Ethernet cable? When you have this problem again, try to ping 127.0.0.1, then ping the IP address on your own NIC, and then ping your default gateway, and finally try to ping an outside website. If it fails on 127.0.0.1 there's a problem with your TCP/IP stack and it needs to be reinstalled. If you can't ping your NIC, there's an issue with your NIC.

 

[MrMeep]

Have you tried using another Ethernet cable? When you have this problem again, try to ping 127.0.0.1, then ping the IP address on your own NIC, and then ping your default gateway, and finally try to ping an outside website. If it fails on 127.0.0.1 there's a problem with your TCP/IP stack and it needs to be reinstalled. If you can't ping your NIC, there's an issue with your NIC.

Right. Up to the first questionmark I followed. I'm not so great with computers, let alone the terminology.... ^^"
When you say "ping" do you mean "write this in the adress bar in your browser" ?
and what's a NIC? - a TCP/IP stack
And the standard gateway can be found by using the command prompt with "ipconfig" right?

 

[evims]

Your default gateway is the IP address of your router. Your NIC is your Network Interface Card. You can get the IP addresses for both by typing "ipconfig /all" into a command prompt. You can ping from command prompt by typing "ping XXX.XXX.XXX.XXX", replacing the X's with your IP addresses. This article will tell you how to reset TCP/IP. http://support.microsoft.com/kb/299357