If you get the activation error code 0xC004F061 when you try to activate Windows 10, 8, 7 or Vista, then you are probably trying to use an upgrade product key in a clean Windows installation or you are trying to use an already used product key to activate Windows on a different machine or hardware.
If you receive an email from the "Mail Delivery Subsystem <mailer-daemon@example.com>", then a message that you had sent has bounced back to you for the specific reason that is reported on the "Mail Delivery Subsystem" message.
Windows boot errors 0xc0000428, 0xc000000f and 0xc0000225 may occur for several reasons: e.g. due to a computer shutdown while installing a critical Windows Update, while upgrading Windows to a newer version or after installing a new software or hardware on the system.
![[FIX] INACCESSIBLE_BOOT_DEVICE, 0x0000007B STOP Error](https://www.wintips.org/wp-content/uploads/2016/10/image-73-150x150.png)
INACCESSIBLE_BOOT_DEVICE issue is also know as Stop 0x0000007B error. This bug check indicates that Windows cannot access the system partition during startup. The BSOD INACCESSIBLE BOOT DEVICE problem often occurs after a Windows update or after refreshing or reinstalling Windows 10 (or Windows 8).
Problem description: The list of features on the "Turn Windows features on or off" list box are not displayed (Features items box is bank) on a Windows 7 or Windows Vista based computer.
One of the most useful tools that Windows contain is the System File Checker (SFC) tool, that gives you the ability to check and repair file system files. To run the SFC tool from Windows, you have to open an elevated command and
Problem description: Windows Features list is blank (empty) – "Turn Windows features on or off" items list is not displayed – in Windows 10 or Windows 8 OS.
Windows Resource Protection could not start the repair service is an error which may occur in a Windows 10, 8, or 7 based computer while you are trying to run the System File Checker tool (SFC /SCANNOW) to scan and repair Windows system files.
Adobe has updated his free "Acrobat Reader" for viewing, printing and annotating PDF's to "Adobe Reader DC", where "DC" means "Document Cloud". The Acrobat Reader DC gives you the ability to work with PDF documents in any desktop or mobile device
In some cases you have to convert MKV to MP4 video format, because the MKV video format is not compatible with all digital devices or Media Players. The MKV (Matroska Multimedia Container) video format is a powerful video format that supports high definition quality,