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

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

If you are using 32-bit version of Windows:
Run Command Prompt as administrator:
Start Menu -> All Programs -> Accessories
Right click on Command Prompt and select Run as administrator
Type the following command in the prompt: reg delete "HKCU\SOFTWARE \Classes\CLSID\{B54F3741-5B07-11CF-A4B0-00AA004A55E8}" /f, then hit Enter.
Next, you must also type the following command: c:\windows\system32\regsvr32 vbscript.dll, then hit Enter.
You should now be able to install your Nitro PDF software product.

If you are using 64-bit version of Windows:
Run Command Prompt as administrator:
Start Menu -> All Programs -> Accessories
Right click on Command Prompt and select Run as administrator
Type the following command in the prompt: reg delete "HKCU\SOFTWARE\Classes\Wow6432Node\CLSID\{B54F3741-5B07-11CF-A4B0-00AA004A55E8}" /f, then hit Enter.
Next, you must also type the following command: c:\windows\syswow64\regsvr32 vbscript.dll, then hit Enter.
You should now be able to install your Nitro PDF software product.