We ran into this when people started migrating to Office/Word 2007. If you see this MS article they explain that basically they took the functionality out and you should just scan things in with your scanner software and then drag it into Word.
In 2007 you could add the Import From Scanner functionality back via creating a macro. This has been confirmed to work in the 64bit Office 2010.
Create the following Macro (View >
Macro > View Macros > Macros in
Normal.dotm > Type 'scan' as the name > Create > Paste in code:
On Error Resume Next
You can then 'Customise the Quick
Access Toolbar' > choose commands
from: 'Macros' and ADD. Then Modify it
to give it a distinctive icon.
This will give you the 'insert from
scanner' box with one click from the
Quick Access Toolbar (QAT).
They seem to want most OCR work done in OneNote these days, so I'm not exactly sure how much OCR is still available in Word (my clients just wanted to scan in images).