Were you using the computer when the power went out?
If it was on, I would suggest running sfc /scannow. A hard shut down can damage files.
Please run System File Checker
The sfc /scannow command scans all protected system files and replaces corrupted and incorrect versions with correct Microsoft versions.
Click on the Start orb and then type cmd in the Search programs and files box.
In the pane above the search box Programs will appear with cmd below it, right click on cmd and choose Run as administrator.
If you are prompted for an administrator password or for a confirmation, enter the password, or click Allow.
This will open the Elevated Command Prompt, it will look similar to the image below.
Type in sfc /scannow and then press Enter to start the scan. Please notice the space between sfc and the /scannow.
If the scan finds no integrity problems in the first portion of the scan it should stop, to be sure that the scan has stopped wait five minutes, then type in exit and press Enter to stop the scan.
When the scan is finished please post the log of this scan.
To find sfc /scannow log, type cmd in the Search programs and files box.
cmd will appear above the search box under Apps., right click on it and choose Run as administrator, this will open the Elevated Command Prompt. This will look simlar to the image above.
Copy and paste the following in the Elevated Command Prompt, then press Enter.
findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >%userprofile%\Desktop\sfcdetails.txt
This will place a new icon on the desktop titled sfcdetails. Click on this to open the log, copy it and paste it in your topic.