Hi sbwhart
after reading your post I've had a look at my computers
and on both ,the adobe FP_AX_CAB_installer was infected

I used stinger10101504 from mcAfee
http://www.mcafee.com/apps/free-tools/termsofuse.aspx?url=/us/downloads/free-tools/stinger.aspxthe report for my machine - the scan took several hours !!!
Scan initiated on Fri Apr 08 00:20:04 2011
C:\Windows\Downloaded Program Files\FP_AX_CAB_INSTALLER.exe
Found the FakeAlert!fakealert-REP trojan !!!
C:\Windows\Downloaded Program Files\FP_AX_CAB_INSTALLER.exe is infected with the FakeAlert!fakealert-REP virus !!!
C:\Windows\Downloaded Program Files\FP_AX_CAB_INSTALLER.exe could not be repaired.
Number of clean files: 1302528
Number of infected files: 1
looking in the "windows folder" on the C drive
its in the folder " downloaded programs files "
the file is {E288E8F-427F-9522-AC9BF37916A7}
its use while installing the PDF reader
now fixed , I uninstalled the old reader and now have the latest :- adobe reader x
thanks for the alert
John