I am newly told I don't have permission to do simple things

Windows 7 Home Premium, 64 bit. I am the administrator (although an admin. password was never set up). For no obvious reason I am now often told I don't have permission for simple operations such as moving a file from one folder to another. Then I get a momentray black screen then "Do you want this program to alter your computer". After that sometimes I can carry out the operation, sometimes I am told I don't have permission and must abort the operation. This happens with other operations which I can't remember at the moment.

Word is a particular nuisance. If I open and amend a Word file and try to save it under the same name by pressing CTRL + S and it saves immediatley. Abnormally, instead of the save being carried out, I am offered a Save D. Box with the file name in it. If I then choose Save I get the error as in the attachment to this post. I must assign another name which I do. The save is then successful. But then I can't delete the old file ("You do not have permission"). This happens every time. My machine is getting littered with un-deletable Word files. (No problem with Notepad nor, I think, with other programs).

I have User Account Control Settings set at default ("Always norify..."). (In any case, that just involves changes being made to Windows.)

How can I get back to normal please?

Thanks.

EDIT: In one folder, (not others) when trying to delete a Word file, I get a D. Box that mentions networks. I am not on a network! (Please see second attachment.)

This has also happened to me. Extremely frustrating.

RolandJS said:

A solution might be to download Windows Repair (All in One), boot into Safe Mode with Network, accept defaults and add items #26 & 27. Restart once or twice, let things smooth out. That often worked for me to restore Windows' internal operations, and the way explorer.exe plays nice with office suite.

Thanks.

https://youtu.be/yrjaZoEZXIQ

is a video of that tool. It lists only 23 tools after clicking on the right hand tab "Start Repairs".

I'd like to know why the dialog saying you don't have permission to do that is also indicating that the drive X is a network drive?

My 10 cents,
That X drive (this new computer) is your internal TB storage device, which obviously has different permissions/privaliges, but only for Word, Dont use it myself but this info might point someone else in the right direction.

Torchwood, that X drive should not be referred to as a network location if it is a local disc on the new computer. That in my opinion is possibly the root of the whole problem.