Ubuntu installation on Windows7 with D partition

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http://askubuntu.com – I have the following problem: I want to install Ubuntu, having already installed Windows 7 and the HD already partitioned. I do not want to erase my data. During the installation procedure I see the following partitions on my HD: sda1- 100 MB sda2 190 GB (this is my windows C:) sda5 285 GB (this is my D: windows partition with my data) sda4 25MB I guess I should resize the space of sda5 in order to leave nough space for ubuntu and swap memory on sda4. However, will this delete all my files on D:? I have also no understanding of the 'mounting directory' option (/windows or /home): what is it f (HowTos)