I need to restore to undo a registry cleaning - Windows 10 is blocking me

CCleaner for Windows CCleaner Windows Help Requests
1

Hello, a few days back my windows PC tower started taking an extra two minutes to fully boot up. I decided to run the registry fixer in Ccleaner.

Now, when I do certain functions with my downloads foder, my computer locks up. The message I see is "Working On It." and then after a few minutes my mouse pointer turns into an hour glass, and the only thing I can do to close the downloads folder (which shows no files) is to go to Task Manager and click "end task."

I'm interested in undo-ing the registry fix I performed with Ccleaner. I have located the file in my Documents folder, but I'm having trouble going back to the previous settings.

When I right click on the file and click on Merge, I get a box which says "Do you want this app to make changes to your device?" I click yes, and get another box which has some warnings saying "Adding information can unintentionally change values...." I cliick on "Yes" to the final sentence, "Are you sure you want to continue?"

Then Windows tells me that it cannot restore the registry. Here is the message I get:

Quote 
<div class="ipsQuote_contents">
	<p>
		Cannot import C:\Users\Xxxx\Documents\cc_20221005_052450.reg; Not all data was successfully written to the registry.  Some keys are open by the system or other processes, or you have insufficient privileges to perform this operation. 
	</p>
</div>

Can anyone suggest what I need to do to get the registry back to where it was a few days ago?

Thanks

2

I just changed myself to the Administrator and tried to go back to the registry settings in the cc_20221005_052450.reg. I'm getting the same error message as before.

I also re-booted into safe mode. I tried changing the registry back and got the same "Cannot import" error message quoted above.

3
I now strongly believe that my problems were caused because at the same time I did Ccleaner reg cleaning to speed up my computer, I also uninstalled Dropbox. 
<div dir="ltr">
	 
</div>

<div dir="ltr">
	I have now
</div>

<div dir="ltr">
	 
</div>

<div dir="ltr">
	1)  re-installed Dropbox and
</div>

<div dir="ltr">
	2)  signed back into it, and..........
</div>

<div dir="ltr">
	 
</div>

<div dir="ltr">
	the problems I have been experiencing have been reversed.  To recap - the problem was that certain programs could not "see" files in my downloads folder, such as Chrome, when I wanted to attach a file to an email in my Yahoo email account by clicking on the papercllip - my downloads folder would appear but no files were visible, simply the words "Working On It" were visible.   
</div>

<div dir="ltr">
	 
</div>

<div dir="ltr">
	I"m not 100% sure that dropbox is to blame for what happened.  However, searching Google for phrases like:
</div>

<div dir="ltr">
	 
</div>

<div dir="ltr" style="text-align:center;">
	<span><b>I uninstalled dropbox and my computer is not working right "windows 10"</b></span>
</div>

</div>

<div dir="ltr">
	and
</div>

<div dir="ltr" style="text-align:center;">
	<span><b>I uninstalled dropbox "downloads folder" "windows 10"</b></span>
</div>

</div>

<div dir="ltr">
	did NOT lead me to any posts resembling the thing that happened to my computer.   
</div>

<div dir="ltr">
	 
</div>

<div dir="ltr">
	I definitely do want to speed up the boot time on my PC (7 minutes seems like a long time!) , but I actually may just ignore the problem for the next few months.  Having spent 7 days worrying that I damaged my system, my current view is that it's just not worth it.  
</div>