OK. firstly boot into windows and defragment your hard drive.

Then boot linux, and go into the Expert partitioning, here select the windows partition and 'edit', and make the last cylinder smaller by an amount you want, then ok, and now create 2 new linux partitions in the gap left behind by the windows shrinkage, make one about 1000MB in size and format it SWAP, and make another to fill the rest of the disk and format it reiserfs, and mount it at / , you will be given all these options during the creation of that partition, once it is settup and you are happy, go forward with the installation.