There's a class modules that's been written (by Stphen Bullen) to extend the functionality of UserForms. You can use this to chose and amend your icon amongst other things. Have a look at this post for the class module code:
http://p2p.wrox.com/topic.asp?TOPIC_ID=19907
The slightly cryptic link in that post referes to this further post:
The two additional lines of code you will specifically need in the vernacular of the archived post are:
Code:
oFormChanger.IconPath = "C:\myiconpath.ico"
oFormChanger.ShowIcon = True
HTH,
Maccas