Posted April 1, 201410 yr Model : laptop ACER M5 series. OS ; Windows 8.0 PROBLEM : cannot run windows after upgrading to windows 8,.1 I tried recovering previous OS version but the OS installation just loops around. It gives me a choice of installing "windows on volume 4" and displays error code 0xc000121a, it then continues with the installation process and displays "Your computer ran into a problem 0xc000121a and needs to restart"... then after a while it displays choose an OS to install again. What seems to be the problem here? Continue reading...
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