Hi,
This is Adware (Called "hungryhands")
here you can find detailed description & removal instructions, if wanted:
Click4Infobest check if any of the malicious .DLL-files mentioned there are left on your PC
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if after reboot a full thorough scan with avast (archivescan enabled) won't show any more infections, it's gone/removed)
(it's still inactive=not dangerous in the avast Chest/quarantine: you can leave it there, or delete it : be sure to only delete files from the "Virus"Section of the chest, NOT system files)
- if you have XP, try a boot-time-Scan with avast (see it's menu/help-files)
- or try a scan in SafeMode (F8-Boot)
you might want to work through the link "VirusRemoval" below in my sig. for detailed instructions/how-tos and how to make you PC more secure for the future
Also run the "Ad-Aware"-Scanner mentioned there