WinXP can not read CDs burnt by Win7

I just burnt a data CD on Win 7 with the default Windows Explorer CD Burning utility. I tried to open the disc on 2 different XP machines and I got an "Access is Denied" error when trying to view the disc. I burnt another CD with a 3rd party program (CDBurnerXP) and got the same result. Both CDs open normally in Win7. Also, this Win7 machine used to burn discs with no problems when it was Vista.

Any ideas? :confused:

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