dllhost.exe Com and maybe powershell.exe, too, disrupting computer.

I've tried Malwarebytes, McAfee, and CC Cleaner as well as restoring to a previous Restore Point in an attempt to get my computer(HP Pavilion dv4) working properly again. Initially, besides running slowly, I was suddenly getting messages from via the internet that my copy of the Windows 7 Home operating system was not valid. I got in touch with someone at Microsoft via online chat, and after some back and forth, he directed me to HP. I couldn't find anything on HP's site that looked as if...

dllhost.exe Com and maybe powershell.exe, too, disrupting computer.