Restoring settings to default?

Question

I have Acrobat 9 Pro on a Windows system.
I've searched the Q&As and couldn't find what I need.  I'm a recreational user, scanning and saving.  I have tailored the 'Creating PDF' settings for decent output from my scanner.  Everything was working fine and then all of a sudden, I couldn't delete a page.
I scanned about 20 pages, saved the file.  Then scanned another 50 pages and clicked on 'Document; Insert pages; From file' and chose the first file.  Once everything was together, I went to delete a page I thought I scanned twice.  I couldn't do it.  The 'Extract, Replace, Delete, Split' etc are not available choices.  One of the help things said to do a 'Preflight' and 'Fixes'.  I tried that and it did not help.  I tried to go to an older doc I had and it was limited, too.  I checked the doc properties and there is no security.
Is there a way to reset ALL settings back to default?  I don't know what to do other than to erase and reload.
Please help ASAP.  I'm trying to get things together for my VA appeal and can't waste too much time.  I'd rather not reload, as that may create more problems.  I'd just like to get back to the baseline and get a few scanner settings in so that I can continue for now.
Thanks for any help.  It is greatly appreciated.

Answer 1

Thanks Mr Kazlow.  When I shut things down and restarted last night, it didn't help.  This morning, it did.  Since then, this is what I've noticed:
1. Plain PDF docs I can insert, replace, delete pages, etc.  All options available.
2. PDF/A docs I can't manipulate.  Even though there is no security, the options just aren't available.
2a. This is the problem because I used to be able to manipulate all files.
3. New scans are PDF/A and I can't manipulate.
3a. This is the problem because I used to be able to manipulate all files.
4. In the Toolbar containing 'Pages, Bookmarks, Layers, Signatures, Standards', the 'Standards' is new.
I think this is where I messed something up in the settings:  I jumped the gun in trying to fix a problem and created a problem, when it may have been as simple as suggested by Mr Kazlow....a file being open by the scanner.
I think I messed up the preflight profiles because that is where the help sent me, to do fixups.  How would I restore those preflight settings to default settings?
Again, thanks for any help available.