System Restore Should Not Be Enabled During Program Installation
When you first enable System Restore, this creates an initial restore point. If you enable
System Restore during a program installation, this may corrupt the initial restore point.
System Restore tracks changes to the registry and system files. By keeping a record
of changes, System Restore can undo the changes to set the computer back to a
previous state, which is also called a restore point. To create a restore
point, use the System Restore program in the System Tools folder, which is on the
Start menu.

In Control Panel, you can enable and disable System Restore in System properties
on the System Restore tab. When you disable System Restore, all previous restore
points are lost because System Restore is no longer able to track changes and is
therefore unable to undo those changes.

When you re-enable System Restore, it creates an initial restore point.
If you enable System Restore while you are installing a program, this may
corrupt the initial restore point as well as all subsequent restore points.
There is no way to determine if the initial restore point is corrupted
---------------------------------------SNIP----------------------------------------------------------------

http://www.kellys-korner.com/xp_restore.htm
http://www.windows-help.net/WindowsXP/xp-sp1-bug.html
http://www.windows-help.net/WindowsXP/kernel-patch-problems.html

Bill :-)


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