[Dj-Icer]

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Does your old HD has a Win XP? Set ur old HD as master and log on. Your partition on the old HD might have been a NTFS format (instead of FAT 32, a standard format). Right click on them chosen files while ur at Windows Explorer, that you want to access later on ur new HD, then go to Properties. Set it as neutral or without security lock. I've done this before but I can't remember the exact thing, so I'm telling you what I remember but the rest, you know what to do. When everythings done, log off and then install ur new HD and log on, see if you can access to ur old folder.

Your new HD may be a FAT 32 format, and it can't access into your old files in ur old HD without permission.

How many partitions do you have in your old HD? If 2 (C: and D: on your old HD), try transfer the chosen files into a safe place (make a special folder or something) that is in FAT 32 format. Then you may format the partition that is in NTFS format to change it into FAT 32, so that there'll be no problem later.

Let us know if theres any problem or further details.