As a precaution, I suggest you boot into Safe Mode and do a search for these files and delete any instances found:
param32.dll
guninst.exe
popup_bl.dll
systr.dll
svrhost.exe
If any could not be deleted -- most likely param32.dll -- run Pocket Killbox
(http://bleepingcomputer.com/files/spyware/KillBox.zip) and paste the full file path of file in the box and click on Delete on Reboot. Click on the button with the red circle and an X in the middle; you will get a message saying File will be deleted on next reboot, Process and Reboot now?, Click Yes to reboot. (Note: the 'file path' will be something like C:\WINDOWS\System32\param32.dll)