Computer slows, Task manager shows approx. 20 instances of dllhost.exe*32 COM Surrogate. Resets IE security to block file downloads. Previously was trying to upload to web sites Appsrumors.com and Searchnet.Blinkxcore.com. Have run SuperAntispyware, MicrosoftSecurity Essentials, Malwarebytes, AdwCleaner, and others, they've slowed down the culprit but it comes back again and again. System is running Windows 7. Any suggestions?