Wireless problem 4 ma dell c640 laptop

I don't think you Dell Laptop Model ha wireless built in on it, but you have a PC card Slot where in you can Either use that slot to insert a Wireless PC card on your system to make it run wireless or use a dongle which is can be purchased from "ISP's" internet service providers, Exampl AT&T they have a usb dongle that looks like a thumb drive but is for accessing wireless signals from AT&T

check this out this is documentation for the type of Dell you have http://support.dell.com/support/edocs/systems/latc640/en/index.htm ^_^

Hi. first is to verify whether you have a wireless card or not by going to the device manager from the control panel.

Expand the network adapter and check if your system came with a WLAN or wireless card. If it's a Dell True Mobile wireless card, you can download the latest driver from this link:

http://support.dell.com/support/downloads/download.aspx?c=us&l=en&s=gen&releaseid=R69905&SystemID=LAT_PNT_P4N_C640&servicetag=&os=WW1&osl=en&deviceid=2491&devlib=0&typecnt=0&vercnt=2&catid=-1&impid=-1&formatcnt=0&libid=5&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=90951

then try connecting to your router by right-clicking the network icon from the taskbar (lower right-hand corner of your screen) then select view available networks and if you see your network there, click it and then connect.

^_^