Hi
Hi
Scan you computer and make sure that it is clean from viruses and malwares.
Download from the laptop's manufacturer support page the latest drivers for the Wireless card, and update the Card's drivers.
Then do this.
WinSock and TCP/IP Refresh.
Type Cmd in the Start Search text box.
Press Ctrl-Shift-Enter keyboard shortcut to run a Command Prompt as an Administrator. Allow elevation.
Type netsh winsock reset in the Command Prompt , and then press the Enter key.
Do the same processes for refreshing the TCP/IP just replace the typed command with.
netsh int reset press Enter
ipconfig /flushdns press Enter
Restart your Computer.
Uncheck the Network Card's Power Saving (I.e., do not let the card save power).
There might be some variations on where the Power saving setting is.
Here are few examples, YMMV, look around in your systems.
Example, http://www.ezlan.net/example/powersave.jpg
Example, 
http://www.ezlan.net/Win7/power_sav_wireless..jpg
Example,
http://www.ezlan.net/Win7/power_save_win7.jpg
Example, http://www.ezlan.net/Win7/adv_power-sav.jpg
Jack-MVP Windows Networking. WWW.EZLAN.NET