Spybot, better than ad-aware.
spywareblaster stops stuff ever getting in.
kaspersky proper anti-virus software.
Digimedia itself is not listed in spywareblasters bases, but it might be planted by something else. 'Internet cleanup' or 'winnow cleaner 3', will erase all cookies, the latter will clear the index.dat file too. It is a freebie on the
.NET magazine in the uk this month.
Check your firewall effectiveness
here at GRC.com using the shields up test.