If you have a:
•EPSON GT-6700
•EPSON GT-S60
•EPSON GT-S600
•Canon CanoScan FB1210U
•Canon PIXMA MX 300
•Canon CanoScan LiDE 90
•Canon CanoScan LiDE 500F
•HP Officejet 7210 All-in-One
REF: http://support.microsoft.com/kb/943087/en-us
The Microsoft Office Document Scanning tool may crash after installing SP1 of Office 2007. Microsoft is aware of the issue, but currently has no fix for it.
Follow these steps to disable OCR, which crashes the scanning wizard…
1. Select your Preset for scanning then expand the Preset Options drop down and select Edit. 
2. Go to the Processing Tab and deselect Use OCR
3. Because Scanning Uses OCR to name the file, disable automatic naming by going to the output tab and changing the File Name to Date and Time.
4. Hit Ok and try and scan something now!
Though not as good as commercial softwares, some online OCR services are not bad, for example, site free ocr.
pregelater -
I did not realize their were online OCR services! Thanks for the tip!