DNS Issue with ClamWin Portable

I'm using v. 0.97.4 and it will not update the virus definitions at all. This has been going on for some time; finally I've gotten around to trying to figure it out. When I run ClamWin, it offers to update, attempts to, but produces the following result:

ClamAV update process started at Sat May 26 12:46:01 2012
WARNING: DNS Resolver: Can't query current.cvd.clamav.net
WARNING: Invalid DNS reply. Falling back to HTTP mode.
WARNING: Can't get information about database.clamav.net: No address associated with hostname
WARNING: Can't download main.cvd from database.clamav.net
Trying again in 5 secs...
ClamAV update process started at Sat May 26 12:46:40 2012
WARNING: DNS Resolver: Can't query current.cvd.clamav.net
WARNING: Invalid DNS reply. Falling back to HTTP mode.
WARNING: Can't get information about database.clamav.net: No address associated with hostname
WARNING: Can't download main.cvd from database.clamav.net
Trying again in 5 secs...
ClamAV update process started at Sat May 26 12:47:17 2012
WARNING: DNS Resolver: Can't query current.cvd.clamav.net
WARNING: Invalid DNS reply. Falling back to HTTP mode.
ERROR: Can't get information about database.clamav.net: No address associated with hostname
ERROR: Can't download main.cvd from database.clamav.net
Giving up on database.clamav.net...
Update failed. Your network may be down or none of the mirrors listed in c:\docume~1\ray\locals~1\temp\tmpnw-2g- is working. Check http://www.clamav.net/support/mirror-problem for possible reasons.
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Completed

Okay, so I did a bit of troubleshooting on my own. I'm using Windows XP, SP3, and do not have DNSChanger on my system according to the site associated with the FBIs effort to let everyone know who's infected. Everything else on my system works fine; the PortableApps update works without a hitch. When I ran a TraceRoute via my router on database.clamav.net that was fine. I found a thread on the ClamWin forums about another update bug, and was able to download the databases manually from a link in that thread. So I can access the server from my system. I posted over on the ClamWin formus, and others who have this version say the desktop version is working fine, so this is specific to the PortableApps version. (That's what they told me. I don't know enough to make that judgment, one way or the other...)

I am totally stumped trying to figure this out.