How do I get my files back?

[picturegifts]

I recently had to re-install Windows 7 and since then I ham having a lot of trouble in accessing files on my D Drive (a 1TB internal device)
When I try to go into a lfolder to view files I get a pop up informing me that " Dont have permission to access this folder" and inviting me to click "continue" to do so.

When I do this I am taken through to "Properties" menu and then onto "Advanced" and then "Permissions" and afrer a few more screens I can then eventually gain access to files

As my drive has literally thousands of folders, I don't fancy doing this every time I want to use a file.

Is there a quicker way of doing this?

[Bobinovich]

This Microsoft page gives details of how to take ownership of all the files en masse

[picturegifts]

This Microsoft page gives details of how to take ownership of all the files en masse

thanks for that Bobinovich. Carried out instructions on page but I am still having problems.
The MP3 directory used to be 140+GB but is now only showing 30Gb.
Have enclosed some screen shots

[dx100uk]

it matters not who views the folder, the size should be the same.

if you are missing files

i'd be inclined to run chkdsk on the ext drive

right click the drive from explorer.
properties
tools
check now
tick the two boxes
start
force a dismount

dx

[picturegifts]

Did a chkdsk and no errors found.
removed disk from PC, did a reboot, closed down and fitted disk again and I got all my files back!
Thanks DX100UK for giving me some pointers

[dx100uk]

anytime

i suspect it did find errors but in the first scan which is quick and scrolls off the screen,
prob the FAT was iffy.

dx