"This news might not be very relevant to most of you, but Adobe has announced that future versions of Photoshop will not be compatible with Windows XP. The Photoshop team would like to provide advanced notice that Photoshop CS6 (13.0) will be the last major version of Photoshop to support Windows XP. (Photoshop CS6 does not support Windows Vista.) In addition, all subsequent Photoshop feature updates specifically for Creative Cloud members will no longer support Windows XP."
Do you have Windows XP? If you have Windows 7, you'll be safe with Photoshop but those XP users...may want to switch.