Q:

How can I get access to EXT2, EX3 and EXT4 partitions on Windows 7? 

I tried all programs recommended to mount Linux partitions like EXT2 or EXT3 or even EXT4 but no one can do well on Windows 7 32 bit. 
I want to access read-write, is there a program that can do this? 

A:

Ext2Fsd looks like what you are looking for. 

Ext2Fsd is a file system driver that allows accessing (both reading and writing) EXT2, EXT3 or EXT4 partitions from Windows.  It works with Windows 2000, XP, Vista and Windows 7. 
Ext2Fsd has limited EXT4 support and by default it will load the filesystems in read-only mode, but you can force this if you really have to write on EXT4 partitions from Windows (this is not recommended).  Using it, your EXT partitions will be displayed just like native NTFS or FAT partitions, being accessible from Windows Explorer. 

Source: Mount EXT4, EXT3 Or EXT2 Partitions In Windows 7 Or XP ~ Web Upd8: Ubuntu / Linux blog

