I have just recently come across this problem myself. I have had a HP SCANJET 6200C for a while now, mostly it sat on a shelf collecting dust, till I had a need for it and plugged it in to my girlfriends COMPAQ XP SP1 (at the time) laptop and was amased that it instantly recognised/detected the scanner. I then later connected it to a desktop that has XP SP2 installed and had the same result...no problems. Scanned away happily....Till only recently, I was amazed when I suddenly discovered that the TWAIN SOURCE had dissappeared from the desktop. IT NO LONGER RECOGNISES THE SCANNER!!?? This desktop is not connected to the internet or any network, and has not been updated in a while, although it does run XP SP2, which is an update, that was quite a while ago. So I am confused too. In an attempt to debug the situation, I then connected the scanner to the aforementioned laptop , this was post an XP SP2 UPDATE! Lo and behold, it no longer recognised the scanner either!
I also came across some nickname for the update HP provides on their site: "DEATH DRIVER"!! The rumour (I dont know how true it is!) is that the drivers that they provide as an update on their site actually kill the USB port on the scanner!!
SCARED? Today, in a mad attempt to scan an image I needed to alter for a company, I got a friend to bring their laptop around, as I knew it hadn't been updated recently.Guess what? IT WORKED FINE! FOR ABOUT 2 SCANS (luckily I saved them knowing how unreliable this system now is) and then the laptop suddenly stopped recognising the TWAIN source again!! This is really scary, and all sorts of conspiracy stuff comes to mind. Any answers anyone out there?? I KNOW THERE IS NOTHING WRONG WITH THIS SCANNER!
YOU CAN SAY THAT AGAIN! Along with about every other HP SCANNER user that I came across that night in a furious attempt to find out more on the net. I bundled into a HP site forum and found about 200 cases of the same incident with no major response from HP!!this is the most annoying pc problem i have EVER had
I also came across some nickname for the update HP provides on their site: "DEATH DRIVER"!! The rumour (I dont know how true it is!) is that the drivers that they provide as an update on their site actually kill the USB port on the scanner!!
SCARED? Today, in a mad attempt to scan an image I needed to alter for a company, I got a friend to bring their laptop around, as I knew it hadn't been updated recently.Guess what? IT WORKED FINE! FOR ABOUT 2 SCANS (luckily I saved them knowing how unreliable this system now is) and then the laptop suddenly stopped recognising the TWAIN source again!! This is really scary, and all sorts of conspiracy stuff comes to mind. Any answers anyone out there?? I KNOW THERE IS NOTHING WRONG WITH THIS SCANNER!