Try a system restore first - nifty tool that often solves many issues....

But anyway.... Blue text means the files or folders are compressed and/or encrypted to preserve data. Right click one of the blue files, select PROPERTIES and down the bottom hit the ADVANCED button and you should see this;



You want to untick the COMPRESS CONTENTS TO SAVE DISK SPACE entry.... Do that, click OK then OK again and it should go back to having black text.....