It is indeed normal for RTL systems to have the start-orb on the right and tray on the left (figures 1 and 2), but notice that the icons in the taskbar face the same way as the ones on a LTR system (figure 3). In your screenshot, the Explorer icon is indeed facing backwards (though the start-orb is facing the right way).
What has likely happened is that the taskbar-modifying program that he installed did not support “i18n” correctly, if at all, and the modifications it made broke something.
Without knowing specifically which program it is, there’s not much anyone can do, and even then, the damage may be specific to that system.
Your/his best chance, in order of difficulty/complication is as follows:
- Use the undo/reset function of the program to hopefully revert its changes
- Fully uninstsall the program (re-installing it first if necessary)
- Try running the System-File Checker in case the program modified system files
- Perform a System Restore to the point before the program was used if possible
- Try the Recovery Options
- Fall back to a repair-install
- As a last resort, do a full re-install and learn a lesson the hard way about trying random software and not backing up
Figure 1: Arabic Windows 7
Figure 2: Hebrew Windows 7
Figure 3: English Windows 7