Hi Annie,
You may want to use the link below to also post in the MS Sharepoint discussion group and detail there the exact steps you're using.
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I have installed Sharepoint Support Tools to allow editing in Sharepoint
Services 3.0 Now everytime I open an Office document from Sharepoint the document tries to download and my Office Locks Up>>
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Please let us know if this has helped,
Bob Buckland ?

MS Office System Products MVP
LINKS
A. Specific newsgroup/discussion group mentioned in this message:
news://msnews.microsoft.com/microsoft.public.sharepoint.general
or via browser:
http://microsoft.com/communities/newsgroups/en-us/?dg=microsoft.public.sharepoint.general
B. MS Office Community discussion/newsgroups via Web Browser
http://microsoft.com/office/community/en-us/default.mspx
or
Microsoft hosted newsgroups via Outlook Express/newsreader
news://msnews.microsoft.com