Whenever I click on one of the Web site buttons on the Project page of BOINC, it opens my text processor UltraEdit instead of Internet Explorer.
I apologize: I don't know how to fix this. There may be some Windows preference or other setting that determines what program (eg, browser) is opened when such commands are given. Hopefully another user will know the answer.

Web site buttons on Project tab execute my default test processo
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All I know is that the BOINC Manager uses a wxWidgets function that looks for the program associated with the MIME type, in this case HTML/TEXT I think.
BM
BM