when u follow the patch instruction from saviour,
after download and trying to patch to 1.21b and u recieve this error msg
"Registry error loading key 'Warcraft III\InstallPath'
The system cannot find the file specified."

means ur wc is not installed from cd.

solution:

<NEWsuperman_alt4> Fixing the ‘Warcraft III\InstallPath’ Registry Error. go here http://koew.net/262

hope this help

P.S: solution given by NEWsuperman_alt4 from zinc channel in IRC

Fixing the ‘Warcraft III\InstallPath’ Registry Error

Posted on March 25th, 2008 - 9:04 pm - 7 comments

When I was going to patch my copy of WarCraft 3: The Frozen Throne (aka WC3) this evening, an error occurred when the patch, War3TFT_121a_121b_English.exe, was executed:

    Registry error loading key ‘Warcraft III\InstallPath’
    The system cannot find the file specified.

The reason I got this error was that my copy of WC3 was from an external backup harddrive, meaning I hadn’t made a fresh install on the harddrive. When I tried to access the Blizzard Support, all I got was “Knowledge Base currently unavailable”. Searching for it gave moot results, such as “re-install the game” and “contact Blizzard”. With a few try-and-fail’s I got it working:

   1. Run the game and make some configurations, then exit game
   2. Run the Registry Editor: Start > Run > regedit
   3. Navigate to HKEY_CURRENT_USER > Software > Blizzard Entertainment > Warcraft III
   4. Right-click, choose New > String Value, call it InstallPath
   5. Right-click on InstallPath and choose Modify
   6. In Value Data, write the adress to your W3C folder, for instance E:\Games\Warcraft III\
   7. Click OK, then close Registry Editor
   8. Run patch

The first instruction is just to make sure there’s some registry details for WC3 for the Registry Editor. The configurations you make in-game doesn’t need to be any special. Just turn the background music off, for instance.

wtf guys, whenever i try to upgrade 1.22 to 1.23 by clicking battlnet, i get the “Fixing the ‘Warcraft III\InstallPath’ Registry Error”
i try what you guys say... NOTHING at all is changed
i did exactly what u said, do i make the configs before or after i try to download
do i make these changes then download or make them after, because after it just goes back to being a normal 1.22 patch, and i don't get anythin that is going on.... sorry for being a noob

sincerely,
your friendly dota gamer