Sorry for not being able to post results from the MiniToolBox, but I don't have access right now to a friend's computer.
His computer is Dell Studio 540 desktop with Windows Vista
Internet connection wired
Cable modem from Time Warner
So he complained about the internet connection problem. At his house I did try ping which did give me errors or packets lost. So I took his computer to my house, connected to my network and tried ping again. No errors, no lost packets. Just in case, I did test the hardware, scan for viruses or malware etc. Nothing, everything ok. Did ping again - no errors. So it looks like his modem or network cable is the problem. I went to his house with my laptop (win7) and a good network cable. I connected my laptop to his old network cable and ran ping again (more then 10 times) trying google.com, yahoo.com, 188.8.131.52 - no errors. So it looks like it's not the network cable or modem. I connected his computer, ran ping and got errors and lost packets again. Switched to my laptop, no errors. I did start his computer in safe mode with networking, ran ping - no errors !?!?!
So, it looks like there is a problem with his desktop but only in his house Why at my house was everything ok ?!?!?!?