In recent usage, the phrase signing statement has referred mostly to statements relating to constitutional matters that direct executive agencies to apply the law according to the president's interpretation of the Constitution.
You might need to exercise a little bit more patience. Though Microsoft (MSFT, Tech30) said a month ago that Windows 10 would become available on July 29, Microsoft clarified on Thursday that everyone won't be able to upgrade on that day. Microsoft will roll-out upgrades slowly, in waves.
Windows 10 is Microsoft's first major operating system upgrade since Windows 8 was introduced in 2012. Windows runs on more than 91% of the world's computers, according to NetMarketShare. Live blog: Get up-to-the-minute details about Windows 10.