I have an unknown wireless network signal in my DELL Vostro laptop and only once time i was access internet with this network.
But now i can't connect with this network and i cant access internet. 
What is this 


[recovering disk space - old attachment deleted by admin]Are you having LAN or wireless connection issues? If the signal being detected or received is from outside sources and not your own connection then you must acquire and setup your own router/modem for any internet activities. Then proceed here -->  http://www.howtogeek.com/howto/27067/change-wireless-network-priority-to-make-windows-7-choose-the-right-network-first/It will show you any Wi-Fi that is in range.

Just because they show on your list does nt MEAN you can connect to them may require password.It appears to be a wireless network that was used somewhere [hotel; coffee shop; etc.] that has been selected as the default wirless goto.
Go to network console and delete it, then search for wirless in area [your own network] and logon.
Windows will remeber this network and goto each time until you select another one. [or VISIT Starbucks again]The wireless network is a VPN (virtual private network). Did you ever use this for work? Usually this type of networks are use to connect to a server to allow access to your work.   What operating system do you have
Here is a RECYCLER.EXE name virus in my laptop and pen drive.
Its not removed by formating and antivirus scaning.