проблема с GetSystemInfo

'lab4.exe': Loaded 'C:\Documents and Settings\Admin\Мои документы\Visual Studio 2010\Projects\lab4\Debug\lab4.exe', Symbols loaded.
'lab4.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\Program Files\AVAST Software\Avast\snxhk.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\user32.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\gdi32.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\msvcr100d.dll', Symbols loaded.
'lab4.exe': Loaded 'C:\WINDOWS\system32\uxtheme.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\advapi32.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\rpcrt4.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\secur32.dll', Cannot find or open the PDB file
'lab4.exe': Loaded 'C:\WINDOWS\system32\msvcrt.dll', Cannot find or open the PDB file
 
 
First-chance exception at 0x7c812d51 in lab4.exe: 0xC0000005: Access violation writing location 0xcccccccc.
Unhandled exception at 0x7c812d51 in lab4.exe: 0xC0000005: Access violation writing location 0xcccccccc.
The program '[2764] lab4.exe: Native' has exited with code 0 (0x0).

    LPSYSTEM_INFO lpSystemInfо;
 
    switch (message)
    {
    case WM_INITDIALOG:
        
                return (INT_PTR)TRUE;
        
    case WM_COMMAND:
    
        if (LOWORD(wParam) == ID_BUTT2)
        {
        GetSystemInfo(lpSystemInfо);
            a=(*lpSystemInfо).dwPageSize;
                }