When trying to install Network Analyzer on a win XP SP2 machine, I get the error:
"There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor."

Any advice?

Stewart

I had something somewhat similar: "DICOM Network Analyzer 3.3.2.msi" stopped install saying WinPCap(4.2.1) was already installed, so Network Analyzer was aborting the install. (it should have been able to simply skip that step and continue.)
Looks like I'll have to de-install winPcap, then re-attempt install of Network Analyzer.

WIRESHARK also installs WinPCap v4.2.1 by default, but a "/S" command line switch can be used to load "default" install without winpcap. - see wireshark v1.4.6 user guide section 2.8.1.4). (I think the default load of wireshark would also detect that winpcap was already installed, and either deinstall an older version and then install the newer winpcap, or skip that step if winpcap were the same version.)
It may be wise to reboot after winpcap deinstall, prior to reinstall attempt.
Note:
- other apps may also use WinPcap, and it could easily be installed directly/independently.
- In the past (on older versions of DVT) there have been issues with older/newer versions of winpcap being incompatible with it.
- The installer needs to include an option allowing the WinPcap install to be skipped if necessary, or to upgrade an older winpcap version if needed. A reboot is probably advisable after winpcap deinstall, prior to reinstall.