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"An Unexpected Error Has Occurred " Error Message When You Try to Install Windows XP:
"This behavior can occur because of damaged random access memory (RAM) modules or a damaged RAM slot"
RESOLUTION - To resolve this issue, use one or more of the following methods, as necessary:
Remove one or more of the RAM modules in your computer, leaving at least the minimum amount of RAM required for Windows XP installation. If this resolves the issue, either replace these modules with new RAM modules or reinsert them after Setup is completed.
NOTE: Verify that your computer's performance is not affected when you reinsert the old RAM modules.
-or-
Install the RAM modules into different (unused) RAM slots in your computer.
-or-
If you still experience problems before or after Setup, replace all of your computer's RAM modules with new RAM modules.