I lost the cd for installing my linksys network pc wireless card wpc11 and cant connect to internet with laptop

If you have the CD that comes with the adapter then you can try uninstall Linksys software and install only the drivers of the adapter.

Remove the Linksys Adapter and un-install the Linksys Software from Programs menu. To re-install the Drivers insert the Linksys Setup CD into your CD-ROM drive. When the Welcome screen appears click Exit. Connect your USB adapter to the computer. When the Found new Hardware Wizard window appears, click Install the software automatically (Recommended) then click Next. Click Finish when the installation is complete.Try to connect to the wireless network again. See if that works. You can also download the latest drivers from Linksys website on any other computer. Save it on a Flash drive and transfer the drivers on your computer.

You can find the drivers here:

http://homesupport.cisco.com/en-us/wireless/lbc/WPC54GS

Select the DOWNLOADS tab
Pick the hardware version on the card

Download the setup wizard, unzip and run it.

Are those 4 ports in different Vlan ?
If you connect your wireless access point to the 1st port are you able to access the internet through 2nd port or 3rd port ?
Are the ports 1-4 admin down ?

go on your network go to "192.168.1.1"

just type it into your web browser.
It will take you to a setup page and thats where you can control everything. Be careful you can really screw things up in there.
go here for more questions

http://homesupport.cisco.com/en-us/wireless/lbc/BEFW11S4?referrer=www.linksysbycisco.com

Here is the starting point for your WPC11 PCMCIA internet card:
http://www.linksysbycisco.com/US/en/support/WPC11/download

Good luck!

its a wireless signal may have to move it around to get your signal things such as walls ,appliances distance can cause signal loss

You can download the driver for this unit from this link

http://www.linksysbycisco.com/US/en/support/WPC11/download

http://drivers.softpedia.com/get/NETWORK-CARD/OTHER-NETWORK-CARDS/Linksys-WUSB54GC-Wireless-G-USB-Compact-USB-Network-Adapter-Driver-3010-Vista.shtml
download from here for vista
http://www.linksys.com/servlet/Satellite?c=L_Download_C2&childpagename=US%2FLayout&cid=1115417109934&packedargs=sku%3D1134691790190&pagename=Linksys%2FCommon%2FVisitorWrapper
try both link u get right 1

Have you set wep appropriately in both the router and the wireless adapter card? It must be configured in both places.

Daniel, this card has a bad history with the MP 790...please see the link for more details. 

http://www.pocketpcmag.com/forum/topic.asp?TOPIC_ID=28448