I have 2 scanners, a Canoscan 8800F and a HP all in one printer copier scanner. Neither scanner is recognised by my PC although I can see them both in the Device Manager under Imaging devices. And Device Manager says that both scanners are working properly.
When I try to use the Canoscan I can see it listed in the software program but when I click Scan I get an error report. Scanner not connected or not turned on. If I try and scan to computer using the HP printer I get the error report' Connection lost'.
I also have a webcam listed under Imaging devices and this is working OK.
I only had 1 system restore point and it would appear that the error occurred before that. I have not used my scanners for several months until yesterday evening when I discovered the problem. Obviously they both worked fine initially but something has corrupted the OS I think.
In reply to John, I normally use Photoshop and yes I have downloaded the latest drivers from both HP and Canon. I have Uninstalled the drivers and then rebooted my system several times before reinstalling without success.
It may be worth uninstalling , say, the Canon. Then re -install using the drivers you have. I seem to remember it liked to have the drivers pre - installed rather than using their disc and certainly not the MS auto install.. I use the TWAIN interface for scanning and with Photoshop CS5 32 bit it works but the 64 bit only works with WPA . I like TWAIN as there is better scanning control. A great scanner , the 8800f as it handles 35 mm slides and negs as well as normal A4, so I hope you get it going. I do remember some problems when I switched to W7 but cannot recall all the details.
PS if you suspect corrupt OS files run the command prompt as an administrator and type in sfc/scannow - it will take a while but should correct minor errors. (Start, All Programmes, Accessories, Command prompt - right click and highlight "run as administrator")