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Nitro Pro 13 Restarting Windows

John Hebert

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I've changed computers and reinstalled/activated Nitro Pro 13, but it is causing Windows 365 to continually restart; every 30 seconds or so. Pleaser help.


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  • Official Nitronaut

Hello @John Hebert

Thanks for reaching out to us! Sorry to hear you are experiencing this issue.

Let's do a cleanup. Please use the tool I have provided below to remove all files associated with Nitro Pro and reboot your system.

NOTE: This clean-up tool will erase any existing signature files within Nitro, so please save them to another location before using the clean-up tool in order to keep them. 
Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004307

When your system is back up, close all your open applications and install Nitro Pro from the page I have provided below:

I hope this helps! Please let me know how that goes.

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  • 2 weeks later...

Hi Leslie,

That didn't work. as soon as I set Nitro as my default PDF reader it does the same thing again. if I change the default reader to something else, Adobe, Edge, etc, it stops. 



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  • Official Nitronaut

Hello John,

Can you please test something out for us to determine the cause of the issue? On the computers causing the issue please perform the following tasks: 

Open a CMD window as an Administrator. 
Navigate to the Nitro folder by entering the following command cd "c:\Program Files\Nitro\Pro\13" and pressing enter

Disable the Thumbnail provider by running regsvr32 /u NitroPDFThumbnailProvider.dll and pressing enter

A prompt saying “DllUnregisterServer in NitroPDFThumbnailProvider.dll succeeded” should appear, just click ok.
At this point, please observe if explorer.exe is still crashing for you or not. 

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I'm not sure if I am opening the window as an Administrator, but I am getting: c:\Program' is not recognized as an internal or external command,
operable program or batch file. 

What next? This is getting frustrating

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