Windows 8 has set some file types to open in full screen Metro applications which can be really annoying, especially if you just wanted to have a quick look at a photo or something. To stop this, you can determine certain applications to open all types of files they are able to open (e.g. Windows Photo Viewer for picture files - jpg, png, etc.).
To do so, hover your mouse over the top right corner to open the Charms menu and open the Search charm. Enter default programs into the search bar and open the search result with the same name. In the appearing window, click on Set your default programs (the first menu option).
In the new window, select one of the programs on the left that you want to use as general default options for pictures, videos, music or another type of files and click on Set this program as default afterwards:
Your files will now be opened in comfortable window applications!
In previous versions of Windows, it was always possible to troubleshoot problems by booting into Safe Mode by hammering on the F8 button on start-up - with Windows 8 CP, this process has become slightly more complicated.
On first glance you may think that safe mode is only to be entered after setting the appropriate options in the msconfig menu accessible by typing the same into a Run prompt. You can do this, however there is also an option you can use on boot - the key combination for that has changed to Shift + F8. So to enter safe mode on boot, hold Shift and hammer your finger on F8 again before the fish appears. If the fish appears without any notion of any repairing attempts, restart again. On the first attempt to do this, it will most likely not work. I needed six or seven attempts to actually get into the advanced boot options, if it does not work for you, try harder! If it did however, you will notice some line stating something about repair. After some possible minutes of auto-repairing the computer itself, Windows 8 finally shows you the advanced troubleshooting menu. Click Advanced Options:
Afterwards select Troubleshoot:
Head for Advanced options:
Afterwards choose Windows Startup Settings:
The next screen shows the actions that will be taken in Safe Mode. Click Restart:
The computer will be rebooted afterwards and you will be taken to the Safe Mode selection screen of the old days:
On Windows 7 it may happen that you are denied access to files that you regularly own and have permission to write to, even if you are logged in as administrator, perform the action as administrator or from an elevated command prompt or try to access it in safe mode.
If this happens to you and you have already tried all usual means, as changing ownership or use Unlocker on it, there is a fix for you that circumvents NTFS security to access the files called AccessGain Tool.
Download it from here: http://www.hobeanu.com/blog/accessgain-tool/
Before you follow the installation guide in the readme-file, reboot your computer and choose the advanced boot options on F8. Select Disable Driver Signature Enforcement there to be able to use the tool properly.
Be careful: This tool grants you access to any files stored on your file system - do not delete any files that you do not know the purpose of!
After crashing your system and getting entertaining colored screens on boot, you may have to consider booting in live mode from a bootable device such as an installation DVD or a USB-device. However you'll need to be able to log in as root in most cases to make changes in configuration files and others to get your system running again. While you can log in as root with a password on your normal system, you can do so in live mode by entering
sudo su -
into the terminal. This logs you in as root so you get to edit your important broken files to be able to boot from your hard drive again.