R3 - URLSearchHook: Yahoo! Toolbar mit Pop-Up-Blocker - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
Looks to me like there ISN'T a pop-up blocker.
You know the routine here if you feel the computer is infected.
Follow the steps given HERE and post back with MBA-M log, and be sure to reboot AFTER completing the scan and removing items found.
Reboot again after doing the ESET online scanner and DO allow it to fix whatever is found even though in the instructions it says not to do so.
Then do another HJT scan and post the log.