Most problems are caused by using peer to peer and/or having some type of spyware that was put on your computer. This causes your connection to fail.Most wireless networks have a troubleshoot button and/or repair button. The repair button does this. It sends the command and does the following, this can be done manually using these commands,startruncmdipconfig /releaseipconfig /renewipconfig /flushdnsIf your computer cannot renew the ip address then you need to use this tool to get thinks working again.It's called WinSock XP Fix. Currently it works for All Windows platforms.
Also try LSP Fix.
Start, all programs, accessories, right click on command prompt, left click run as administrator. Type
netsh winsock reset catalog
This will reset the winsock catalog
Winsock2 How to determine and to recover from Winsock2 corruption in Windows Server 2003, in Windows XP, and in Windows Vista
Windows 8 may not be able to connect to some Cisco routers
Windows Vista cannot obtain an IP address from certain routers or from certain non-Microsoft DHCP servers
Also try reading...
Intel® WiFi Products — Power Save Polling (PSP) causes connection issues with some access points
Also try some of the other Networking tips and tweaks
If you're still having problems, please make a new thread in the Dell Networking, Internet, Wireless Forum
If you find this Wiki helpful, please vote above. Thanks.