No worries.
PowerPC is the older family of processors used in Macs (G4 and G5 Macs). The software written for these is thus in the PowerPC flavor.
When Apple decided to jump ship using Intel processors instead of PowerPC processors, they had to come out with a new software format that will run at native speeds on both Intel and PowerPC processors. This software format is called "Universal Binary". Most software packages will state on the box whether it is Universal Binary.
So when you run a PowerPC only software like MS Office 2004 for Mac, it will still run on your new iMac, but in an emulation mode. It literally launches a "translator" called Rosetta to translate PowerPC code to Intel code. In short, launching such PowerPC software on an Intel Mac now takes up more RAM, and runs slower, which is very evident in CS2.
Presently, CS3 for Mac comes in Universal Binary, and so does OpenOffice.
thanks for explanation.i learn new things everyday.:thumbsup: