HI Guys dis is Erick Gipit from the Philippines
I hope my solution would be appropriate for all of you. But first let me tell you my problem.
My computer started to read "USB Device Not Recognized" after I had installed my SAMSUNG D900 Software which I used for downloading pictures, video,music from the Net to my D900 Cellphone. Unfortunately, my computer didn't recognized my 4 USB ports. And it was a real pain in the arse coz I wasn't able to use my videocam for chatting - which is my fav past time. So, I tried to find answers from forums on the net and found out about "compatdb.com"...
There was a tip where It told me to unistall other USB program in my Control Panel - Add/Remove Program. And then to uninstall all the USB devices in my Device Manager in Safe Mode. And turn off my computer and unplug all power cords. After few minutes I turned on my PC in windows and bhwala.... It worked again... Now I can use my favorite webcam for chatting.
What I learned is that maybe if we've installed a software for our cellphones, mp3, digicam, videocam in our PC it installs other USB ports and software. This probably blocked other USB ports and cause them not to read your USB Device/Hub. Just like what happened to me; Samsung installed other port in my Device Manager - Universal Serial Bus Controller. I forgot the exact name of that port that Samsung created. But after uninstalling it, my 4 USB ports started working again.
I hope this would help you guys in your problem.