I finally gave in. Not only Yahoo didn't work, but now nothing responded anymore. 5 minutes, and that was it, after that, everything dead. When I got the warning "Windows Explorer is not responding", I was done. So, this morning, I finally decided it was mal-wared beyond repair, saved my shit and called the Toshiba help desk, because the disks I burnt didn't work, and the recovery thingy that they built in didn't work either. He gave me a nice little trick (VERY simple) and darlin'-puter was on the way back to recovery again. 2 hours later, it worked like a charm again.
Even yahoo works again!

I'm still thinking that that 1 corrupted file messed with everything. But that is not important anymore
