Переменные среды в реестре прописываются в раздел
Раздел [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]
Для восстановления значений переменных сред скопируйте в блокнот и сохраните файл с расширением reg
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]
"Path"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,\
00,73,00,74,00,65,00,6d,00,33,00,32,00,3b,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,3b,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\
53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,57,00,62,00,65,00,6d,00,3b,00,43,00,3a,00,5c,\
00,56,00,63,00,3b,00,43,00,3a,00,5c,00,41,00,72,00,63,00,3b,00,00,00
"TEMP"="C:\\Tmp"
"TMP"="C:\\Tmp"
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment]
"Path"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,\
00,73,00,74,00,65,00,6d,00,33,00,32,00,3b,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,3b,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,\
53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,57,00,62,00,65,00,6d,00,3b,00,43,00,3a,00,5c,\
00,56,00,63,00,3b,00,43,00,3a,00,5c,00,41,00,72,00,63,00,3b,00,00,00
"TEMP"="C:\\Tmp"
"TMP"="C:\\Tmp"
