Vista - Cannot find wireless networks/Cannot enable wireless connection

I'm running a Toshiba Satellite L300 with Windows Vista Home Premium x64 and a T6400 processor. I haven't had any connection problems untill now. The problem I'm having now is Windows cannot find any wireless networks. I can connect through a Ethernet cable but not wirelessly. Another thing that bothers me is that I can't enable the network connection in the network connections folder. I don't know why this is happening suddenly as I haven't made any changes involving my network settings at all. I've looked it up on the internet but couldn't find anything that would help me. One solution that looked promising was: no wireless networks were found in range error

That didn't work though because my "event log" service was already set to Automatic so my case must be different. All help is appreciated and thanks a lot.