I am seeing hkey_current_user Chinese characters on my Regedit - should I be worried?

I am having this doubt that my system has been hacked into. I notice huge drops in free hard disk space for a while and then the space returns to near old values. A few days ago, when I clicked "my computer", I saw the properties of the computer instead of "my computer". SThe startmenu showed me the same thing. I rebooted my system and things became normal. All my browsers hang for a while. Additionally, sometimes my FB login page looks weird and unlike the regular page (browser injection?) Then, there are these Chinese alphabets in the attached image:

Is it possible that my system is infected with some stealthy malware? If yes, how do I check if it is really malware?