If all goes well, the SSD will be the first one that appears when you power up your PC, and should be the one that boots into Windows.
Solid atate disks (SSD) offer an easy, and relatively inexpensive means of boosting the performance of an older PC. The SSD behaves like a standard hard disk, but it uses memory chips instead of hard disc platters, so it is significantly faster, quieter and more reliable.. In Windows, if the operating system and paged memory are migrated onto the SSD, the PC's performance should increase significantly. It is possible to run several operating systems, like Ubuntu and Windsows 7 using separate partitions on the SSD. You will then use a boot manager, like the one that installs in Windows, to select which operating system launches.