when I started to go on the net my wireless icon dropped out and then reappeared but I had no internet My network lets say name is roses now it appear's as linksys a non secure network and when I right click the icon and ask to review available networks I see linksys along with roses and a third one linksys ow 552615. how do I get my network back . also an error message pops up saying there are two networks with the same name when i go into dhcp table I find three different IP & MAC addresses one has no name and the other two are named roses wireless network hijacked

It could only be hijacked if you didn't change the default admin password or left it open with no wireless encryption. Pull out the router manual, reset the router to factory defaults and walk thru the manual page by page until you are done configuring and securing your router. Ask questions here if you get stuck. You will need to tell us the make and model of the router when that time comes.