Access denied on external hard drive.

I have an external drive, which works perfectly well. But I've just updated from vista to W7, and now I can not access the disk from that specific computer. I get access denied. On the properties, all users have full access. And the funny part is on my other computer, with the exact same OS, the drive works perfectly. So, I expect that there is a setting that I didn't know.
Is there someone with good ideas on how to solve this problem?

Hi I tried your instructions below to restore all my administrator permissions full on my external hard drive.

1. click on Start , click all programs , and click Accessories .
2. right click on command prompt , and then click run as administrator .
3. in administrator: command prompt window.
4. type
takeown /F (external drive letter) and press ENTER.
5 type
CACLS (external drive letter) /G Administrator: F and press enter

After that I followed these steps, my computer Windows 7 says that the drive is not accessible.  I plugged it to my old XP computer, and it also says "access denied."  I have a huge amount of important files there and I need to restore access, but I can't find an answer for how to cancel the steps I followed.  Please tell me how to reverse the steps I did your earlier suggestion.

Tags: Windows

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