After two years of steady, agonizing declines, the PC industry appears to have hit rock bottom. And, according to research firm Gartner, things could be looking up, which should spell good news for manufacturers ranging from Apple (AAPL) to HP (HPQ) and Windows maker Microsoft (MSFT). “There is evidence that the PC market’s decline has finally bottomed out,” Mikako Kitagawa, research director at Gartner, said in a statement. “Seasonal demand from the education market boosted shipments in the third quarter, although enterprise PC demand remained weak, offsetting some growth. Vendors also made consistent progress towards reducing PC inventory, with inventory…