Why is my scanner not shown or not responding in the browser?

Why is my scanner not shown or not responding in the browser?
Sometimes, you will encounter an issue where your scanner is not shown, not responding or shown as busy in the browser.
Causes:
1. The scanner is not connected to the machine or the scanner driver is not installed.
* Especially when you are using 64-bit Internet Explorer but you don't have 64-bit scanner (TWAIN) driver installed on the machine.
2. The Browser doesn't have enough permission to access the scanner driver.
*This mostly happens on Windows 7/Vista/2008 OS where a high security level is applied to
Internet Explorer. It would also happen in Firefox 4+ and Safari.
Resolution:
1. Make sure the driver of the scanner is installed and the scanner is running and properly connected to the machine. You can use Twacker to check if the driver is TWAIN compatible.
In addition, if you are using 64-bit Internet Explorer, please make sure you have a 64-bit TWAIN driver of the scanner installed.
2. For Firefox, Safari, etc., please go to C:\Windows\twain_32 and you should be able to find that your scanner driver has a sub-folder there. In order to show the scanner as an available source, you need to copy the dlls in the sub-folder and paste them to the folder C:\Windows\System32 (or C:\Windows\SysWOW64 on a 64-bit OS).
For Internet Explorer, you can try one of the following tricks:
#1:
Add the website to the zone of trusted sites. IE | Tools | Internet Options | Security | Trusted Sites.
#2
Turn Protected Mode off.
To turn off the protected mode of IE, you can go to Tools | Internet Options | Security
and uncheck "Enable Protected Mode (requires restarting Internet Explorer)" option.
FYI, Protected Mode helps protect users from attack by running an IE process with
greatly restricted privileges. It uses the Windows Vista integrity mechanism to run the Internet Explorer process at low integrity. But with Protected Mode turned on, you may encounter problems when running Dynamic Web TWAIN applications.
#3
To temporarily elevate permissions of IE: click Start, point to All Programs, right-click IE, and then select Run as Administrator (with Administrator permissions).
Is my scanner driver TWAIN compatible?
If you are not sure whether your scanner comes with a TWAIN driver, you can use TWACKER, which is a tool developed by the TWAIN Working Group, to verify it.
TWACKER can be downloaded here: TWACKER 32 bit TWACKER 64 bit
After installation:
Launch the program.
Click menu File -> Select Source and select your device in the ‘Select Source’ list.
If your device is not listed, please check that your scanner is connected to your machine and if the driver is installed. Or, you can try running TWACKER as "Admin" since you may not have permission to access the data source.
Click menu File -> Acquire to do scanning.
If the scanning is successful without any errors, then your device should be TWAIN compliant.
If it failed, you may have to search online or contact the device vendor for a TWAIN driver.
How do I uninstall plugin/add-on?
ActiveX
You can follow the steps below to remove Dynamsoft ActiveX control:
1. Remove the corresponding ActiveX control class from IE->Tools->Manage Add-ons select “All add-ons”.
- DynamicWebTwain Class
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