SP2 Prerequisites

Does anyone ever remember having to download "prerequisites",for a SP?

If you do not use the Installation Manager, the download pagecomes up with (6) windows files that must be downloaded andinstalled before the SP. No explanation or help included. A few ofthem I am not sure about because I already have a similar versioninstalled. I have asked my IT guy, but he is not sure.

I already have Microsoft Office 2003 Web Components, but a prereqis install MO Web Components 11. Similar issue with Microsoft C++Runtime. I have Microsoft Visual C++ 2005 Redistributable. If Iinstall these new files, what happens to the other ones? Will itaffect any of my Microsoft programs or do I need to update them tosome new version too?
SolidworksGeneral