Solution:
1. Download and install the program from this site.
http://www.faststone.org/FSResizerDownload.htm
2. From the left pane, browse the photos you want to downsize and click 'Add' or 'Add All' to queue on process.
3. Check 'Use Advance Options...' and Click Advanced Options
4. Select Resize, Select 'In Percentage'. Select either 25% or 50% (depend how huge is your photo).
5. Browse the 'Output folder and click 'Convert'. Wait until conversion is finished.