To prevent this error from appearing, please follow these instructions.
Please create (or have your IT department) an exception for the web IP address, name and port below. Once you have done this, please run the installer again.
www.ononesoftware.com
209.162.184.76
standard web  port 80

For Vista you will want to try to go to Local Disk (C:)\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup.  See if there is a shortcut to the registration program for the onOne product that is asking you to register.  If you see a shortcut called Register (onOne Product Listed here) go ahead and delete it.

NOTE: If you are not able [...]

Please note that there is an incompatibility with the Windows version of Photoshop CS4 and the onOne menu. When installing any of these updates for Windows Photoshop CS4, the onOne menu may not be present, as you have seen in the past. If you do not see the onOne menu, you can access the plug-in [...]

Below is a list of suggestions to help circumvent the memory errors
1.    Adjust PS Memory allocation to 75%
2.    Turn histories down to 4
3.    Close other applications, restart Photoshop
4.    Go straight to plug in
5.    Flatten the image to an 8bit
6.    Use early in workflow before upsizing
7.    If using a layered file, process only one layer
When the [...]

This kind of error can happen when you are using Smart Objects.  This kind of layer is something the plug-ins are not compatible with.  You would want to rasterize the Smart Object first.

The steps below will resolve the issue.

Mac users:

Please launch the Activity Monitor (Go to the Mac HD\Applications\Utilities)
Choose “All Processes” in the upper right pull down menu of the Activity Monitor
Locate the process named NalpierondVb, select this process and then click on the Quit button (you may also see NalpeironV, Nalpeiron5, or Nalpeiron6)
Choose the Force Quit [...]

If you are receiving an error message like this it can be due to the AST Service not starting up.  This service is part of our activation process.  You can start this manually.

Windows 7
This is due to the User Account Control (UAC) in Windows 7 being turned on. Please adjust the UAC settings (steps 1-5) [...]