Malware still there after READ & RUN ME

When I run Spybot Search & Destroy I find several
instances of SpyWare. Anenue A, inc., DoubleClick,
Mediaplex, and sometimes Advertising.com.

I remove them, then the next time I connect/sign in to
Yahoo, they re-appear. I can also remove them by
"deleting cookies" within IE properties (or by using
ccleaner). I'm running IE ver 6.0.2900.2180.xpsp
_sp2_gdr.050301-1519.

My machine is an HP Pavilion a527x, product number;PC
032A-ABA, Software Build;42NAheBLU4, Hardware BOM;
0nB121110,Software BOM;NA50, Service ID;061-804.

I have followed you instructions in "READ & RUN ME FIRST
Before Asking for Support" through step 6. Including the
CWShredder and Kill2Me.

Bitdefender found nothing, but Panda ActiveScan indicated
that there are 7 infected files. All appear to be cookies, but
I don't know how to prevent them from running.

And, signin/signout on Yahoo will cause the DoubleClick
malware to reappear. Staying signed in longer will result
in more malware showing up.

I have attached BDSCAN.TXT, ACTIVESCAN.TXT and
HIJACKTHIS.LOG which are the "saved" logs from their
respective scanners.

You might also want to see a 'print screen' of an error that
frequently appears at boot up - see MsWinDefender2.doc.
(Only able to have 3 attached files and I think the logs
are probably more important than the 'print screen'.
I'll send it later if you want to see it.)

Are these types of Malware serious, or am I just wasting
my time (& yours) trying to get rid of them?

 

Thank you very much for your reply. I'll certainly
follow your suggested steps. I'm quite relieved to
have verified that cookies are not that much of
a threat (still, they're a nuisance).

I do appreciate the time it must take you folks
to research and respond to the many request for
assistance you must receive.

Thanks again