The Multiprocessor Support update fixes a problem discovered after Photoshop CS2 (9.0) was released. Machines with more than 4 processors in total (counting HyperThreading) will now use all of those processors.
-- Adobe Photoshop CS2 (all language versions)
-- Windows: Microsoft® Windows® 2000 with Service Pack 4, or Windows XP with Service Pack 1 or 2
To install the Photoshop CS2 Multiprocessor Support update:
1. Exit Photoshop CS2
2. In Windows Explorer, Oopen your Adobe Photoshop CS2 folder.
3. Open the Extensions folder inside the Plug-Ins folder.
4. Delete or backup and rename Multiprocessor Support.8BX.
5. Copy the new Multiprocessor Support.8BX into your Extensions folder.
This update will work only with the retail version of Adobe Photoshop CS2 (9.0.x) software and not any pre-release (Beta) versions. To confirm that the update is
successfully installed, launch Photoshop, go to the Help menu, select System Info, find Multiprocessor Support in the list of installed plug-ins, and verify that the Version is 9.0.2. The version number can also be found by right-clicking on the plug-in itself, selecting Properties, and then selecting the Version tab.