Windows 7 - External hard drive problems

To save space on my laptop, I have moved a lot of files (mainly Word or Excel) to my portable external hard drive which is attached via USB to my laptop.

I have set some of the folders in the drive to be included in my Documents library and shared with my Homegroup.

However, when I try to open them, I am told I do not have permission.

As I am the owner of the files, how do I fix this, please?

This will tell you how to take permissions. Good luck

Take Ownership of file - Vista Forums

This will be the same in Vista and Windows 7

TY for the rep.

If the problem has been rectified, post for the information so that other members may benefit from your experience. Thanks again for your kind words.

Did you use the external drive with another system? That's how the permissions could have been changed.

My external hard drive is used for my laptop, which used to run Vista before Windows 7.

Have a look at this: How to Take Ownership and Grant Permissions in Windows Vista My Digital Life

I followed these recommendations but now have the
Grant Admin Full Control option on my right click in Explorer.
Unfortunately, this also shows up in my Guest ID which, obviously, I do not want.
How do I remove it, please?

Any advise for #7 question, please?

I believe that the user in the guest account would have to know the admin, password. Give it a try to be sure.

If that is the case the user would not have access.