H E L P ! - How to replace missing/deleted "Path" in Environment Variables ?

I attempted to add a new Path Variable to System Variables on PC-1 by

Right Click My Computer | Click Properties | Advanced | Environment Variables

- clicking "New"

- then entering "Path" as Variable

- then entering "c:\program files\folderX" as the Value.

In doing so I guess I wiped out the prior System Variables "Path" values

- One symptom is Windows Security Alert does not see that I have MS Security Essentials installed and working.

- I'm sure there are other issues as well.

Question 1:

Can I just copy the Path's from another XP Pro machine... PC-2?

.. The path is gone on a PC with a lot of software installed (PC-1)

.. The other XP machine (PC-2) has almost no software on it.

.. The Path for the System Variables on PC-2 is...

%SystemRoot%\system32%SystemRoot%%SystemRoot%\System32\WbemC:\WINDOWS\system32\WindowsPowerShell\v1.0

Question 2:

If I can do this should I do it in Safe Mode or what?

Question 3:

This was done yesterday... can I just "restore" PC-1 to day before yesterday status?

.. and btw, will I loose bookmarks saved after the restore point?

Question 4:

Or what should I do? (I'll lose a week if I have to re-install Windows and all the App's)

Thanks for any help !

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