USB should normally install/include it's own drivers. So my guess would be they aren't needed and the software should be able to find the emanage.
Greddy does state this(while it is unlikely that this is a issue due to backwards compatibility some 32bit driver do only work on 32bit installations. This would require the installation of a 32 bit windows 7 to fix):
It does not work on 64-bit Windows. Please use it on the 32-bit version of Windows.
Greddy's description:
[Cause 2] The driver is not set up correctly.
(※Confirmation method)
Control Panel → System → Device Manager → USB Controller
If there is a yellow "!" Or "?" Mark on the, the installation has not been completed successfully.
[Countermeasure 2-1]
1. Right-click on the item and select Properties
2. Delete
3. Replug the USB
4-1. When "New hardware found" is displayed after reinserting
Select "Manually search for drivers"
Select the following as the selection destination and click OK.
Computer → Local Disk (C) → Program Files (x86) → TRUST → GReddy e-manage Ultimate → driver
4-2. When the "!" Mark is displayed immediately after reinserting
The PC has selected and applied a driver that is not for e-manage (e-manage Ultimate).
Computer-> Local Disk (C)-> Program Files (x86)-> TRUST-> GReddy e-manage Ultimate-> driver-> PreInstaller
Select to install the driver package.
* How to change the behavior related to PC driver installation
Search for and run "Change device installation settings".
Change device installation settings → No Select the execution method → Do not install the driver software from Windows Update → Save the changes
After that, execute [Action 2-1] 4-1.