command prompt and high cpu utilization problems

I have an Acer Aspire laptop. Windows 7-64 bit. My CPU usage has been quite erratic for months. She sometimes becomes up to 4 or 5%, but most of the time, he is running between 50 and 100% (I have a counter on my desk). I've been running all kinds of tools and cleaning methods. I had McAfee antivirus for a prior year of minimal, but renewed problems a few months ago and found strange and annoying that he wouldn't be updated every day while I was working. I assumed something was wrong with her, so I replaced it with a program that I got for free with another purchase from Best Buy... Trend Micro, I think it was called. Well, it appeared that Trend Micro used more process and CPU than McAfee. At that time, I thought it would be safer and cleaner for Microsoft Security Essentials TM trade. I also have CCleaner installed and I run it every other day or two. I also run r-kill and tdsskiller a few times but never found something dangerous. I removed everything that I felt uncomfortable unused programs were safe to remove. The last thing that I see and which seems odd to me is that, at startup, a "command prompt" icon will appear briefly in my taskbar and then quickly go to 'start' 'recent '... I have never seen this before so it seems weird, like a clue any. Also in the last few days, usually online, but also with Solitair Windows offline. Either the cursor will freeze or the screen freezes making useless cursor, even for a moment, and sometimes I'll just "end task." I'm not a gamer, I mainly watch movies and videos... Try, anyway! Thanks in advance for the help!

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