Usual caveat: messing with regedit can blow up your computer and render you sterile.
Use Office Update to install service pack 3 (if not already installed)
http://update.microsoft.com/windowsupdate/v6/default.aspx?ln=en-us
OR
download the Service Pack 3 standalone module at:
http://www.microsoft.com/downloads/details.aspx?FamilyId=85AF7BFD-6F69-4289-8BD1-EB966BCDFB5E&displaylang=en#filelist
THEN:
1. Quit all Microsoft Office programs.
2. Click Start, click Run, type regedit, and then click OK.
3. Locate and then click to select the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Common\Open Find
4. After you select the key that is specified in step 3, point to New on the Edit menu, and then click DWORD.
5. Type DisableAutoSelect, and then press ENTER.
6. Right-click DisableAutoSelect, and then click Modify.
7. In the Value data box, type 1, and then click OK.
8. On the File menu, click Exit to quit Registry Editor.
This supposedly disables a feature called "Autoselect" which may be at the heart of the problem. YMMV