Laptop Wifi refuses to connect to internet if router has encryption

An Acer Aspire 5520-5142 laptop I have will not have internet access if the router's wifi is encrypted (with anything, WPA,WPA2, WEP...), but will work fine if it is not.

I have tried the following:

- Updated Router's Firmware
- Have the latest wifi drivers for laptop
- Turned off firewall
- Reset wifi drivers
- Reset router
- Disabled all AV software

Why does this happen and how can it be fixed or diagnosed?
getekeAsked:
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DangItMarilynCommented:
Try using a lower bit wep connection. Like 64 bits. Some adapters won't work with 256 etc encryption. :)
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IanThCommented:
does it work next to the wifi router what I mean is there any local enviromental issues that could stop the laptop connecting?
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getekeAuthor Commented:
The laptop connects to the router fine even with the encryption, but it will not go on the internet.  In essence:

LAPTOP    +++++++ ENCRYPTED WIFI ++++++++++   NO INTERNET CONNECTION

LAPTOP     -------------- NO ENCRYPTION  --------------   INTERNET CONNECTION

It can connect to the ROUTER from anywhere in the house.
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Justin EllenbeckerIT DirectorCommented:
When you go into the wifi adapter properties is there one in the list of protocols name AEGIS.  I have seen this service screw up many networks.  Just uncheck it from the wireless adapter and see what happens if it is there.
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getekeAuthor Commented:
I am not familiar with AEGIS. How could I disable it in Windows Vista or find how to diable it?
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IanThCommented:
what encryption are you using?
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getekeAuthor Commented:
WPA2-PSK
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DangItMarilynCommented:
Try disabling IPv6 in Network Connections>Wireless Connection> Properties

If you're using Win7 or Vista this can cause a hiccup as it constantly tries to touch base.
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Justin EllenbeckerIT DirectorCommented:
Follow Dandits steps and the same area where you can disable IPv6 you can uncheck the aegis protocol.
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DangItMarilynCommented:
Also, if you're using an antivirus program and it has a line in that same area, uncheck it as well to see if it connects. For instance, with Norton Antivirus there is an entry called Symantec that must be unchecked to connect in some networks.
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getekeAuthor Commented:
I will retry resetting the router again. I will keep you guys informed.
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smiffy13Commented:
If the laptop is connecting to the router; it's getting an ip address & you can network to other PC's for example, then it sounds like a problem with the router. Have you got another wireless device that you can test with this router?
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getekeAuthor Commented:
All other devices, including other laptops and even iPods, connect to the router fine and get online fine.  It's this one laptop that refuses to get online despite the fact that it does connect to the router and it can be seen by other devices.
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