I'm having the same/similar issue. Computer all of a sudden running like mollases, especially once getting on the Internet. Have Windows 7 pro 64. Have 8 gig ram. Have Webroot SecureAnywhere on my machine. I think it caught a suspicious threat scanning it. Also have run malwarebytes antimalware. It removed a couple threats. After looking at the processes running, a ton of the dllhost.exe *32 are running. CPU usage in the %90s, physical memory in the high %80s. Not sure what to do next...
20+ dllhost.exe*32 running...sigh
20+ dllhost.exe*32 running...sigh