Im getting that my hard drive is missing?

What do these mean and how can I fix the problem? Please help me out cause I'm gonna go crazy over here if I can get rid of this crazyness. Just last night a bunch of things kept saying my hard drive was missing and now everytime I restart my computer this "Win Scanner" says its defragmenting my computer and its just annoying. what does this mean? C:\ProgramData\ykAGlpHBmWgv.exe C:\ProgramData\iH5KwqLPnNHiAT.exe C:\Program Files\Google\Update\GoogleUpdate.exe C:\Program Files\Google\Update\GoogleUpdate.exe I'd like to add that NO I don't have an anti-virus on my comp. Its a Gateway

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