Iking0623,
I do not know if your issue was resolved/ However, here is the fix for this as Support is somewhat useless...
http://www.nitropdf.com/kb/article.aspx?id=10106&cNode=3D8W4P
Q10106 - ERRMSG: Error 2738. Could not access VBScript run time for custom action.
The information in this article applies to:
All versions of Nitro PDF Professional and Nitro PDF Express.
All versions of Windows Vista.
Symptoms
When installing or uninstalling the following error message is displayed.
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
1.1 Start Menu -> All Programs -> Accessories
1.2 Right click on Command Prompt and select Run as administrator
2. Type cd %windir%\system32 into the Command Prompt and hit Enter
3. Type regsvr32 vbscript.dll into the Command Prompt and hit Enter
Regards.