Edirol UA-20 Owner's Manual page 17

If you changed the "Driver Signing Options" setting (p. 13, step 4), restore the
setting to its previous state after restarting Windows.
1.
Log on to Windows using the same user account as the one used when the
driver was installed.
2.
From the Windows start menu, choose Control Panel.
3.
In "Pick a category," click Performance and Maintenance.
4.
In "or Pick a Control Panel icon," click the System icon. The System
Properties dialog box appears.
* Depending on your system, the System icon may be shown directly in the Control
Panel (Classic view). If so, double-click the System icon.
5.
Click the Hardware tab, and then click [Driver Signing]. The Driver
Signing Options dialog box appears.
6.
In Driver Signing Options, restore the previous setting ("Warn" or
"Block") and click [OK].
7.
Click [OK]. The System Properties dialog box closes.
Next, you need to set your computer so priority is given to
background services, which will help to assure that audio and
MIDI processing occur smoothly.
(➔ "Giving priority to background services" (p. 18))
Driver installation and settings (Windows)
17