A good place to save them to in the future is the Photoshop Actions folder in the Presets folder.
Once you replace the file on the new computer with that you should see your old sets. Then, don't neglect to Save them. Hope this works.
C:\Documents and Settings\[login name]\Application Data\Adobe\Photoshop CS Settings
Under normal circumstances Photoshop files (like this one) are "hidden." So the computer techs will need to turn on the Windows file/folder view option to "show hidden files/folders" as well as the comparable setting in the File Find dialog, otherwise they will not find it.
FYI: In CS Actions Palette.psp shows up as file type "Shortcut." It's really not a "shortcut," but that's OK. PS knows what it is.
If you created any new actions in PS "on the new machine," save the Action Sets in a convenient location, e.g., Desktop, then shutdown PS.
Replace Actions Palette.psp on the new computer with the one from the old computer. When you bring PS up again, your previous actions will be visible in the Actions Palette. Load any .atn files from your Desktop or wherever they may be and you'll be in business.
Note: It's not a good practice to create new actions inside the Default action set. If you have to reinstall Photoshop, they would be lost. While you're thinking about it create a new action set and drag/drop actions you created in Default into it. Then save the new action set to your hard disk.
If the computer tech folks "backed up your files from your hard disk somewhere else," like to another drive or online somewhere and only got \My Documents, that would explain why they cannot find ActionsPalette.psp
If PS was working OK when they got their hands on your old computer and they backed up your entire C:\ drive, then they're goofing up.
Where can I find them????
I looked under Program files>...PS2>Presets>Photoshop actions for .atn files but all i see id the "factory default" actions"
They might still exist in the .psp file. That is usually somewhere in Documents and Settings.