The information in this article applies to:

• All versions of Nitro PDF Professional
• All versions of Nitro PDF Express

Problem

When installing Nitro PDF products on Windows Vista or Windows 7, the following error is generated:

Error 2738. Could not access VBScript run time for custom action.

Cause

This error message indicates that the VBScript engine is not currently registered on the machine where the install/uninstall is taking place.

Resolution

The VBScript engine can be quickly registered by following these steps:

1. Run Command Prompt as administrator:
1. Start Menu -> All Programs -> Accessories
2. Right click on Command Prompt and select Run as administrator
2. Run the following command:
• If you are using 32-bit version of Windows:
• Type cd %windir%\system32 into the Command Prompt and hit Enter
• If you are using 64-bit version of Windows:
• Type cd %windir%\syswow64 into the Command Prompt and hit Enter
3. Type regsvr32 vbscript.dll into the Command Prompt and hit Enter.

If the above solution does not work, try the following alternative steps:

If you are using 32-bit version of Windows:

1. Run Command Prompt as administrator:
1. Start Menu -> All Programs -> Accessories
2. Right click on Command Prompt and select Run as administrator
2. Type the following command in the prompt: reg delete "HKCU\SOFTWARE \Classes\CLSID\{B54F3741-5B07-11CF-A4B0-00AA004A55E8}" /f, then hit Enter.
3. Next, you must also type the following command: c:\windows\system32\regsvr32 vbscript.dll, then hit Enter.
4. You should now be able to install your Nitro PDF software product.

If you are using 64-bit version of Windows:

1. Run Command Prompt as administrator:
1. Start Menu -> All Programs -> Accessories
2. Right click on Command Prompt and select Run as administrator
2. Type the following command in the prompt: reg delete "HKCU\SOFTWARE\Classes\Wow6432Node\CLSID\{B54F3741-5B07-11CF-A4B0-00AA004A55E8}" /f, then hit Enter.
3. Next, you must also type the following command: c:\windows\syswow64\regsvr32 vbscript.dll, then hit Enter.
4. You should now be able to install your Nitro PDF software product.