Registry access fail

/***********************************
NOTE: All app and variable names are
changed.
------------------------------------
Included files: iostream, string,
winreg.h (through windows.h)
IDE: Visual C++ 2008 Express
***********************************/

/***********************************
The data structure that can be seen
below looks like this:

struct apps
{
    string installPath;
    string exePath;
    string iniPath;
};
***********************************/


#define BUFFER 8192

void getApps()
{
    char ValueBuffer[255];
    HKEY hKey;
    DWORD BufferSize = BUFFER;

    if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\AppVendor\\APPKEY1", 0, KEY_READ, &hKey) == ERROR_SUCCESS) //This one succeeds
    {
        RegGetValue(hKey, NULL, "PATH", RRF_RT_ANY, NULL, (PVOID)&ValueBuffer, &BufferSize);
        cout << "1: Application 1" << endl;

        string bufferConvert(ValueBuffer);

        app1.installPath = bufferConvert;
        app1.exePath = app1.installPath + "app1.exe";
        app1.iniPath = app1.installPath + "app1.ini";

        memset(ValueBuffer, '\0', 255 );
    }
    else
    {
        cerr << "ERROR opening APPKEY1" << endl; //
    }
    RegCloseKey(hKey);

    if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\AppVendor\\APPKEY2", 0, KEY_READ, &hKey) == ERROR_SUCCESS) //Strangely, this key opens...
    {
        RegGetValue(hKey, NULL, "PATH", RRF_RT_ANY, NULL, (PVOID)&ValueBuffer, &BufferSize); //...But this function fails (Error 234: ERROR_MORE_DATA, according to MSDN)
        string bufferConvert(ValueBuffer);
        app2.installPath = bufferConvert;
        memset(ValueBuffer, '\0', 255 );

        //This "if...else if" structure is there because there are two mutually exclusive versions of the app
        RegGetValue(hKey, NULL, "EXEFILE", RRF_RT_ANY, NULL, (PVOID)&ValueBuffer, &BufferSize); //This one also fails
        if(ValueBuffer == "app2verA.exe")
        {
            cout << "2: Application 2 Version A" << endl;
            app2.exePath = app2.installPath + "app2verA.exe";
            app2.iniPath = app2.installPath + "app2verA.ini";
        }
        else if(ValueBuffer == "app2verB.exe")
        {
            cout << "2: Application 2 Version B" << endl;
            app2.exePath = app2.installPath + "app2verB.exe";
            app2.iniPath = app2.installPath + "app2verB.ini";
        }

        memset(ValueBuffer, '\0', 255 );
    }
    else
    {
        cerr << "ERROR opening APPKEY2" << endl;
    }
    RegCloseKey(hKey);

    if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\AppVendor\\APPKEY3", 0, KEY_READ, &hKey) == ERROR_SUCCESS)
    {
        RegGetValue(HKEY_LOCAL_MACHINE, NULL, "PATH", RRF_RT_ANY, NULL, (PVOID)&ValueBuffer, &BufferSize); //Works, though it's the same as before
        cout << "3: Application 3" << endl;

        RegGetValue(HKEY_LOCAL_MACHINE, NULL, "PATH", NULL, NULL, &ValueBuffer, &BufferSize);
        string bufferConvert(ValueBuffer);
        app3.installPath = bufferConvert;
        app3.exePath = app3.installPath + "app3.exe";
        app3.iniPath = app3.installPath + "app3.ini";

        memset(ValueBuffer, '\0', 255 );
    }
    else
    {
        cerr << "ERROR opening APPKEY3" << endl;
    }
    RegCloseKey(hKey);
}