Wifi issue on laptop

I hav licensed windows 7 installed on my Dell Inspiron N4010. I am facing problem with wifi connectivity. My wireless cards shows list of wirless routers in my office but when ever i try to connect them it displays message unable to connect. Please tell me what would be reason. There is no firewall install on my laptop. Only microsoft security essential is installed on it. Windows is fully updated.
imz-ezAsked:
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Jakob DigranesSenior ConsultantCommented:
download inSSIDer and look at wireless channels.

And look at power settings for wireless. This is often a problem with broken connection during time, not when connecting - but still - look at power options - advanced settings and wireless card and set it to maximum performance on both AC and battery
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Jackie ManCommented:
1. Connect to physical LAN (ethernet)

2. Run windows update to get the latest driver for your wireless LAN.
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imz-ezAuthor Commented:
dear I wana use wireless. I know i can use internet via lan cable.
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Jackie ManCommented:
yes, when you need Internet access to do windows update
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tastasI.T.Commented:
Here are some things which you can check.

1.  verify that both your wireless card and wireless router are on the same channel such as N, G or B.  In addition, they are on compatible with WEP/WAP/WAP2, etc

2.  Verify that you enter the correct WAP/WEP keys

3.  Verify that you do not have MAC address setup on the router.  If you do, then you need to add your laptop MAC address to your network.

4.  Try an USB wireless card and see if it works
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Gerwin Jansen, EE MVETopic Advisor Commented:
You can try using the troubleshooter, right click your network icon and select "Troubleshoot problems". The wireless routers that are shown, do you have access to them / do you know the passphrase or key to access one of them? You can download the latest network driver for your network card (      
Dell Wireless WLAN 1501 Half Mini-Card (4313bgn), v.5.60.48.18, A00) here:

http://support.us.dell.com/support/downloads/download.aspx?c=us&l=en&s=gen&releaseid=R252536&formatcnt=0&libid=0&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=369562
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imz-ezAuthor Commented:
My wireless card drivers are uptodate. Secondly key to access wirless router is true. Windows is updated.
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BlueThundaCommented:
Here's an option to try.

Sometimes with wireless adapters, the information stored gets mucked up and the only way to remedy this is to go into Device Manager, remove or uninstall the adapter in question, then restart your computer. FYI, Device Manager is searchable in the start menu, to uninstall merely locate and right-click your wireless network adapter in the list, then click - Uninstall.

Upon restarting, Windows will automatically detect the adapter, and once you go to connect and enter the access point password or key things are all good.

If this doesn't help, was the laptop in question able to access the wifi at your office before? Does it work in other locations?

Good luck ;)
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andymacfCommented:
Have you tried disabling the MS Security and trying it? You could also add the address of your router to the trusted zone on your laptop. Also check DNS settings.
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Gerwin Jansen, EE MVETopic Advisor Commented:
Please have a look at the Windows event log, anything special in the System or Application log?
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Jakob DigranesSenior ConsultantCommented:
download inSSIDer from www.metageek.net 
look into what channels the AP's is sending on. If they're on the 2,4 Ghz band - make sure they're not on any channels above 11, if they're set on Auto - many AP's tune in to channel 13 which has more or less less interference than any other channels, but some WiFi NIC don't support other channels above 11.
Also see if AP is sending on HT 20/40 Mhz - that is utilizing several channels (like channel 86 - 94 on 5Ghz)
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imz-ezAuthor Commented:
Sometimes my wifi works and sometimes it dosnt. It shows list of wireless routers but when i try to connect it failed.
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imz-ezAuthor Commented:
thanks
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