Fix for fresh Windows 7 installation BSOD C000021a Fatal System Error 0xc0000001 0x00100448

Patient: Toshiba Satellite A300D PSAH8A-01J00H, Vista 2GB RAM 320GB HDD BIOS 1.8

This model can only be found on Toshiba Europe website and was sold in Australia. No BIOS/drivers update found from Toshiba. No A series from Satellite family and there is a A series in Satellite Pro family but no A300D product.

Windows Vista 32 bit works fine, but fails with BSOD C000021a Fatal System Error 0xc0000001 0x00100448 after Windows 7 64 bit installation. Windows installation completed and then first reboot, BSOD. It also fails during installing intermittently while trying fresh install over 10 times.

Diagnosis: Passed Memory and HDD test. Vista 32 bit and Windows 10 64 bit work fine.


  • Swapping RAM
  • Swapping HDD
  • Reset COMS
  • Disable Dynamic CPU


Windows 7 32 bit


Toshiba Satellite A300D