For the 250 GB SATA HDD connected to SATA_3, is it a brand new empty drive? If it is, you must prepare it for use before Windows can use it. This can be done using Windows' built-in tool Disk Management. If you are not familiar with this, look around here for postings on Partitioning and Formatting a new drive.
Now, the third disk is a 160 GB IDE device with jumpers set to Slave, you say. Is it the ONLY device on that IDE port and cable? If so, it REALLY should be set to Master. This does NOT make it the Master of your machine - there is no such thing. It only makes it the Master of that one IDE port, and that port NEEDS a Master device to work properly.