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Sorry, it is Turkish.. but i can explain :
1-TOP HEADING with white background is smthg.like : WINDOWS BOOT MANAGER
2-and then : chose an OS to boot or press TAB to choose a tool
3-between brackets : to highlight your choice , use the arrow keys and then press ENTER.
4- And then again a white bar and " WINDOWS7 " written in it..
5- And then TOOLS: Windows Memory Diognastics ( I once run it but found no problem-error)
6- finally a white bar on the bottom with button explanations like : ENTER = CHOOSE, ESC = CANCEL
Hope it is clear enough..
And also looked at BIOS but couldn't find any setting about boot drive..
EDIT 1: I ALSO REALIZED THAT PC BRINGS THIS SCREEN JUST WHILE RESTARTING, NOT WHILE TURNUNG ON..
EDIT 2: THERE IS NO PROBLEM ABOUT USING THE PC AFTER CHOOSING OS..