Trojan. Poweliks and .Adclicker removal HELP, please!

Hello, my Windows 7 Home Premium SP1, desktop running the most current and recent updates of NIS, MBAM, however Task Manager is showing numerous instances of dllhost.exe*64's running. NIS gives me warnings that Trojan.Poweliks and Trojan.Adclicker have been detected, along with a couple IP's which have been blocked, but apparently I'm already infected.  I've run MWAR and NPE, but they did not fix the problem. I can kill the excess dllhost.exe*64's by unplugging the modem and killing the processes, but the eventually re-appear after a while, or after a re-boot. A dllhost.exe*32 seems to reappear with the same Process ID in the command line of the Task Manager each time. The excess dllhosts.exe's seem to be slowing down my PC and bandwidth. Is there anything I can to do to eliminate this? Is my PC and personal data at risk?  Thanks in advance.