HI There,
There are a number of reasons why this could be happening. Unfortunately I do not know whether you are using a wired connection or wifi. I am guessing in these modern days that you are using wifi but I will post a few things that might help anyway.
Try These:
1. If you are using a wire to connect your router (modem) to your computer, change it. Try a different wire (also called a patch cable) and see if that fixes it.
2. Always remain conscious of the fact that you may have a faulty router. Try switching off your router for 30 seconds and then switching it back on again. Wait for it to initialize and see if that helps.
3. Your computer's NIC (Network Interface Card) may have a dmaged or corrupt "driver". Drivers allow the components in your computer to communicate properly. A damaged driver will mean bad or no communication. So here is what to do to check your driver.
a: right click on "computer" or "My Computer" in the start menu.
b: From the menu that appears, choose MANAGE
c: From the subsequent box that appears choose "Device Manager" in the left side panel.
d: A list of all the devices attached to your computer will show in the large window. Do any of them show a tiny exclamation mark with a yellow background? Whether they do or not, search for the entry in the list that says "Network Adapters" - Click the little triangle beside it.
e: Right click on the first entry and from the menu that appears, choose Uninstall (left click). Wait for the computer to do a little bit of processing. The list may refresh a number of times and the item you just uninstalled may disappear from the list. This is normal and good.
f: Do the same procedure for the next item in the list under the heading "Network Adapters" until all of the Network Adapters have been UNINSTALLED.
g: Restart your computer, with the internet cable connected (If you are using an internet cable). If you are using wifi, ensure it is enabled before restart. -
h: On re starting, your computer will find the items you just uninstalled and will automatically RE-INSTALL them. By doing this, your computer might fix the problem by loading a good driver (in case the old driver was bad).
i: Try your internet after around ten minutes. see if the problem is fixed.
NEXT SOLUTION:
4. Are there other Routers nearby? Do you live in a block of flats or a busy thoroughfare where there are lots of internet connections showing on your wifi list? If so, then it is possible that another router nearby has the same "Channel" as your router and your WiFi card is getting confused as to which router to connect to. - You need to change your Router's WiFi channel. To do this:
Check out these Web pages:
a: http://www.pcadvisor.co.uk/how-to/network-wifi/3325316/how-change-wi-fi-channel/
OR
b: http://www.metageek.net/forums/showthread.php?6379-How-To-Change-the-Channel-of-Your-Wireless-Network
NEXT SOLUTION:
5. You may need to download another driver for your Network Card on your laptop.
a: Download this driver and install it (double click on it)
http://www.getdriver.com/download/3050/broadcom-lan-driver-14-0-1-0-10-8-mb-acer-aspire-5742z-driver-windows-7-x86/#.U5Aq4rHIytM
b: Also Download this driver and install it...
http://www.getdriver.com/download/3071/atheros-wireless-lan-driver-9-0-0-202-9-2-mb-acer-aspire-5742z-driver-windows-7-x86/#.U5ArU7HIytM
c: Finally, Download this driver and install it...
http://www.getdriver.com/download/3071/atheros-wireless-lan-driver-9-0-0-202-9-2-mb-acer-aspire-5742z-driver-windows-7-x86/#.U5ArU7HIytM
NOTE: Driver B and C above are both for your Wireless Card. One is for a WiFi card made by Atheros and the other is for a card made by Broadcom. Your Laptop does NOT have both cards in it, but I do not know which one it does have so download both. It is possible that on installing, one of the drivers may fail (as the WiFi card for that driver is not in your laptop). in that case, install the other one.
"A" above is for your Network connection when using a cable (non-WiFi). This should be installed to ensure your cabled internet continues to run smoothly.
I am afraid that Is all I have for now. As I always do, I advise you to always use extreme patience when dealing with computer problems. Sometimes your computer looks like it is doing nothing when it actually is processing. But don't grow a beard waiting like.
Hope some of these help.
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