I have an Asus EeePC 1225B with an existing Windows 7 installation on it. The hard drive layout is like this

Partition 1: UEFI Boot 15MB
Partition 2: C:\ Windows 7 100GB
Partition 3: D:\ Empty NTFS partition 200GB
Partition 4: Win7 Recovery partition 15GB

I'd like to install Backtrack 5R2 on this laptop but this is my first experience UEFI so I'm a bit cautious and don't really know where to start.

I have no CD-media for Windows 7 so I really don't want to have to re-install it (not sure how I would do that without the recovery partition in place and untouched).

I'm hoping I could just install BT5R2 on partition 3 (or in the space which currently holds partition 3 at least) somehow and not touch the rest of the partitions much but I'm just not sure where to start here.

Any and all advice and pointers would be very much appreciated.