no internet on desktop

[Xm@n]

I have desktop computer with WIN XP Home conected wirelessly to Siemens 555
wireless router for ADSL connection.
As protection I had WEP/WAP (or similar) pasword protection and MAC filter
turned on.
Everything was fine. Both computers connect wirelessly to Internet separatly
and at the same time if needed.

Then I recently baught a laptop (T61 with WIN XP Professional) and try to
connect it wirelessly to Siemens 555 for Internet.
Could not do it until turned off WEP/WAP protection so now there is only MAC
filter turned on as protection.

The problem is that few days ago I completly lost Internet on desktop PC.
Firefox, IE, Outlook express and other programs ... nothing can access
Internet.

The laptop T61 works normaly (internet connection) but desktop PC can not
connect.
However it conects to Siemens router easily and it show Connected and green
D (for D-link wireless).
I can also connect to Siemens router from desktop and work on its settings.

As there is a workin connection through laptop I can not blame Internet
company or Siemens router.

The problem is that I am not Matser of networking or simmilar and do not
know where to start and what to check.
I also do not know exact time when this happen as I acces Internet upon need
and I can only remember that there was some regular win updates.
I also had tried to connect desktop PC and laptop T61 wirelessly but could
not succed.

Now I am in danger to start changing some settings I don't even know what
are used for and this can make everything even worse.
Tried to make System restore but could not do it (it was not possible
message say).

Any idea what to check hot to approach and what to look for?

Thank you in advance for any idea.

 

[Jack \(MVP-Networking\).]

Hi
Use a wired computer to connect to the Router and set the Wireless setting
from scratch (the manual of your Router should explain it for your specific
Router).
When done, configure the Wireless computers with the same settings.
In general.
My Wireless does not work - http://www.ezlan.net/wireless.html
Wireless Basic Configuration - http://www.ezlan.net/Wireless_Config.html
Wireless Security - http://www.ezlan.net/Wireless_Security.html
From the weakest to the strongest, Wireless security capacity is.
No Security
MAC______(Band Aid if nothing else is available).
WEP64____(Easy, to "Break" by knowledgeable people).
WEP128___(A little Harder, but "Hackable" too).
WPA-PSK__(Very Hard to Break).
WPA-AES__(Not functionally Breakable)
WPA2____ (Not functionally Breakable).
Note 1: WPA-AES the the current entry level rendition of WPA2.
Note 2: If you use WinXP and did not updated it you would have to download
the WPA2 patch from Microsoft. http://support.microsoft.com/kb/893357
The documentation of your Wireless devices (Wireless Router, and Wireless
Computer's Card) should state the type of security that is available with
your Wireless hardware.
All devices MUST be set to the same security level using the same pass
phrase.
Therefore the security must be set according what ever is the best possible
of one of the Wireless devices.
I.e. even if most of your system might be capable to be configured to the
max. with WPA2, but one device is only capable to be configured to max . of
WEP, to whole system must be configured to WEP.
If you need more good security and one device (like a Wireless card that can
do WEP only) is holding better security for the whole Network, replace the
device with a better one.
Jack (MVP-Networking).

 

[Xm@n]

Thank you for your help and informations!

Hi
Use a wired computer to connect to the Router and set the Wireless setting
from scratch (the manual of your Router should explain it for your
specific Router).
When done, configure the Wireless computers with the same settings.
In general.
My Wireless does not work - http://www.ezlan.net/wireless.html
Wireless Basic Configuration - http://www.ezlan.net/Wireless_Config.html
Wireless Security - http://www.ezlan.net/Wireless_Security.html
From the weakest to the strongest, Wireless security capacity is.
No Security
MAC______(Band Aid if nothing else is available).
WEP64____(Easy, to "Break" by knowledgeable people).
WEP128___(A little Harder, but "Hackable" too).
WPA-PSK__(Very Hard to Break).
WPA-AES__(Not functionally Breakable)
WPA2____ (Not functionally Breakable).
Note 1: WPA-AES the the current entry level rendition of WPA2.
Note 2: If you use WinXP and did not updated it you would have to download
the WPA2 patch from Microsoft. http://support.microsoft.com/kb/893357
The documentation of your Wireless devices (Wireless Router, and Wireless
Computer's Card) should state the type of security that is available with
your Wireless hardware.
All devices MUST be set to the same security level using the same pass
phrase.
Therefore the security must be set according what ever is the best
possible of one of the Wireless devices.
I.e. even if most of your system might be capable to be configured to the
max. with WPA2, but one device is only capable to be configured to max .
of WEP, to whole system must be configured to WEP.
If you need more good security and one device (like a Wireless card that
can do WEP only) is holding better security for the whole Network, replace
the device with a better one.
Jack (MVP-Networking).