|The version of Solitaire built into Windows XP is located in c:\windows\system32\sol.exe|
and Internet Backgammon is located in C:\Program Files\MSN Gaming Zone\Windows\bckgzm.exe
Can you confirm that the programs themselves are actually missing and you're not talking about a program shortcut, perhaps those found in your Start Menu?
Also, can you confirm that you're actually talking about the Microsoft versions of these games and not ones you personally downloaded?
Apologies if I don't respond to your reply immediately. I don't check this site daily, but you're welcome to PM me as a reminder.