I recently bought a new SSD (Sandisk Ultra Plus) to install on my Asus P7P55D motherboard. Both the BOIS and Win7 detects the drive (it shows up under Disk Drives of Device Manager) but it does not show up under My Computer. The option to install Win7 on the new drive does not show up either when I put in the upgrade CD.
Click the start button. In the search box, type in "disk management". Click on "create and format hard disk partitions". Look for your SSD. Right click it and select "change drive letter and paths..." then assign it a drive letter. If it isn't formatted, you can format it there as well.
Once you are able to see it, you should install any software that came with the drive. You should also turn off indexing and automatic defragmenting if they are on. They will wear out your SSD much faster than if they were off.