Whew where to start, first Welcome to the forums both carlos2009 and brianzion.
Ok access from windows to ext2\ext3 partitions is not possible without help from third party apps.
See the link below for alternatives.
Three Ways To Access Linux Partitions (ext2/ext3) From Windows On Dual-Boot Systems | HowtoForge - Linux Howtos and Tutorials The three programs listed will work with Win 7 to allow you to access your Linux partitions.
The third program listed "ext2 installable filesystem for windows" allows read\write access as well.
The "ext2 installable filesystem for windows" will install with no problems in Win 7 by using compatibility mode for XP.
It runs fine, I use it on my system.
The other programs install with no need to resort to compatibility mode.
Actually the first listed program "Explore2FS is standalone, no install needed.
I've tried all these programs and they work for Ubuntu up to and including Ubuntu 8.04 LTS and all versions of PCLinuxOS up to at least PCLinuxOS 2009 (PCLinuxOS 2010 is in developement right now).
The problem with later versions of Ubuntu including the version you are using is this.
Although all these versions of Linux use the ext3 filesystem, Ubuntu, starting with Ubuntu 8.10 began using a version of ext3 that used 256 byte inodes instead of the previously default 128 byte inode size.
None of the programs listed will work with Ubuntu 8.10 and beyond because of this situation.
The program I use (Ext2 Installable FS) will assgn a drive letter OK but attempting to access the partition results in a message telling me that the partition is unformatted.
There is a 4th option "Virtual Volumes" that is in beta that will work
read only with your version of Ubuntu.
It is beta and a little crude compared to the other alternatives but it will allow reading 256 byte inode ext3 file systems.
chrysocome.net - Virtual Volumes