Can someone external reset my Autorun on a WinXP machine?

I've been having some strange computer occurances, all starting two
weeks ago when my AV detected some malware on my computer,
JAVA_BYTEVER.A. These are the files that my software detected:

JAVA_BYTEVER.A = BlackBox.class
JAVA_BYTEVER.A = Bug.class
JAVA_BYTEVER.A = Dummy.class

th.jar-fb0a0d9-42a11ab0.zip

The files were removed and I haven't had any further problems until
today. I tried to download some digital photos to my HD and the
AUTORUN was not working. When I plug a card into my card reader, the
autorun pops up and wants to know what I want to do normally. I just
used it a few days ago and it was working fine. Then I noticed that
all Autorun stopped working, including my two CD bays. I finally got
it back up and running by using TWEAKUI. The Autorun had been turned
off. (I didn't turn it off.) Also, when I accessed my Control Panel,
I got an error message about encountering some problem opening IE. I
wasn't opening IE. When I did, my browser homepage had been hijacked
with this:

http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.

MSN is not my homepage.

I did update my Windows (XP) the other day, but that's all the contact
I have had with MS recently. There have been some recent updates in
the past few days.

I scanned for viruses and also ran Ad-Aware. Nothing.

What could possibly turn off my autorun feature? Is this something I
should be concerned about?
.

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