The download may be corrupted; check the file size: it should be 10.0 MB / 10,280 KB / 10,526,720 bytes.
If it is different, download it again from http://www.adobe.com/support/downloads/detail.jsp?ftpID=4881
Unfortunately that message can indicated a whole lot of causes, and we need to find out what it is. A few questions:
Try downloading it from an alternate location: ftp://ftp.adobe.com/pub/adobe/reader/win/10.x/10.0.0/misc/FontPack1000 _ja_JP.msi
Europe, Middle East and Africa