Can you see the folder which you can't open in the first place ?
I still think that as an administrator you are allowed to alter the security option for that particular folder if you are using Windows built in function. Just right click on the folder and check the security tab in properties dialogue box . Give access to all users for a time being and check, maybe it will work. You have to be logged in as an administrator to run this process.
If it doesn't work then create the user with same password as in previous machine and try to open the folder, sometime the Windows can be fooled.
If you had used 3rd party encrypting software, then you have to install that again.
This is kinda interesting ( sorry ), so please let us know how things go.
BTW did you use the proper data cable and the jumper while trying to run your disc as a master ?