Tag Archives: Windows 7

Windows 7 Boot Error with MpFilter.sys corrupted

After doing patch-Tuesday update yesterday, my Windows 7 no longer booted. This is the second time it happened. Last time I fixed it, didn’t get to document and it took me a while to figure out how I did it.


This version of Windows is Windows 7 Professional 32-bit. After some digging, MpFilter.sys is Microsoft Malware Protection Minifilter, which is a part of Microsoft Security Essentials (MSE). MSE is installed on my Windows 7 machine.

The fix is to boot from Windows 7 DVD, selecting “Repair your computers”. Then click on the command prompt option.

cd \windows\system32\drivers
ren MpFilter.sys MpFilter.sys.bak

After that, just reboot the machine. It should work. Finally, uninstall and reinstall Microsoft Security Essentials (or use a different antivirus program).

Ref: http://www.sevenforums.com/general-discussion/284941-windows-not-booting-7.html

Windows 7 64 bit on Toshiba Satellite A200

I just finished installing Windows 7 64-bit Ultimate edtion on my 1+ year old Toshiba laptop. The model is Satellite A200-*****.

The installation went smoothly, well almost. On the first boot, the graphic card driver, the finger print reader were automatically updated with Windows update. The only two devices which weren’t detected are: unknown device “ACPITOS6205” (bluetooth) and the Texas Instrument 5-in-1 card reader. The 64-bit driver for the bluetooth can be downloaded from: http://aps2.toshiba-tro.de/bluetooth/ thanks to this post at Toshiba Laptop forum.

Unfortunately, I haven’t found the place to download the driver for the card reader yet. Oh well, it doesn’t bother me that much; so I’m just gonna leave it for now.

What’s next? I have to restore Grub bootloader so that I can boot back into Debian. 🙂