Entering path in the run window gets a "file not found" error.
Entering echo %path% gets "echo not found" error
This is XP, right? Go to Control Panel - System - Advanced, click the "Environment Variables" button, and see what is showing in the lower pane (titled "System Variables") for the Path variable. The default value for this is:
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem
There may be other values appended or prepended, but you should see at least the above folder paths.
If it is empty then click Edit and paste the above in and click OK repeatedly to get right out back to Control Panel and then reboot.
If it is not empty click Edit and highlight the whole string and copy and paste it here.