Lots of progress has been made in fixing installer bugs lately,
but there are probably many such bugs hiding in plain view still.
It would be very helpful if people could look for bugs which:
a) appear to be MSI or setupapi related, and
b) occur in freely downloadable executables (e.g. trial versions)
c) aren't already in bugzilla
(see
http://bugs.winehq.org/buglist.cgi?product=Wine&component=wine-msi&keywords_type=allwords&keywords=download&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED
for list)

and file reports as appropriate at http://bugs.winehq.org.

Thanks!
- Dan