well u have been infected with webdir adware
http://castlecops.com/tk1907-pxwma_dll.html
and also alexa (toolbar) malware
http://www.spywaredata.com/spyware/m...alxtb1.dll.php
i suggest u scan ur pc with with a good antispy freeware like adaware/spybot AND ewido anti-malware.
i also urge u to switch from Download Accelerator
to any other malware free download accelerator.
O9 - Extra button: Run DAP - {669695BC-A811-4A9D-8CDF-BA8C795F261C} - D:\PROGRA~1\DAP\DAP.EXE