Paintshop is no where near as good as photoshop CS5, however, if you are low on cash, paintshop might be cheaper
No Photoshop CS5 and Photoshop Elements are separate programs.
CS5
yes.
Photoshop CS5
Photoshop CS5
Yes, you can upgrade from Photoshop CS3 (or earlier) to Photoshop CS5 Extended, no problem.
cs5 is better
In Extended version you have 3D Tools to work with 3D Objects.
Adobe Photoshop CS5
Adobe photoshop CS5 (extended)
Go to C:\Program Files\Adobe\Adobe Photoshop CS5\Scripting in Windows XP or find Photoshop\Scripting folder on your computer for detailed information's.
Adobe Photoshop CS5