How Do I Get Current Cpu Frequency And Harddisk Name

You can get the cpu freq from the registry, or you can calculate it yourself.
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHZ

You can get info about the harddisk in roughly the same place:
HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\Scsi\Scsi Port 0\Scsi Bus 0\Target Id 0\Logical Unit Id 0


In order to compute the speed yourself, you can use the following code. The value returned is the speed in MHz. Divide by 1000 to get GHz.

unsigned int hiPart, loPart;
unsigned __int64 CycleCount()
{
    __int64 result;
   asm(
    "rdtsc\n"
    "mov %eax, _loPart\n"
    "mov %edx, _hiPart"
   );
   result = hiPart;
   result <<= 32;
   result |= loPart;
   return result;
}
int GetCpuSpeed()
{
   unsigned __int64 start, stop, elapsed;
   unsigned int total;
   start = CycleCount();
   Sleep(1000);
   stop = CycleCount();
   elapsed = stop - start;
   total = (unsigned)(stop/1000000);
   return total;
}

In my case, the registry returns "2494" (Mhz) and the above snippet returns a value of 2,492 (Mhz).