It will not show in My computer until is has been formatted and/or assigned a drive letter.
Click on start, right click on computer and select Manage. Click on disk management, does the SSD drive show if it does you should be able to format/assign a drive letter.
If you are doing a clean install from a disk I would just plug the SSD drive in without the other drives go into the bios and change the settings to AHCI before doing the install.
If you are going to migrate you original drive over to the SSD drive you can use one of the free Partition management programs.
If your OS has already been installed and your computer boots from IDE you will need to alter the registry before changing the bios to AHCI CLICK HERE for instructions.