11. Fujitsu LifeBook S752
Most PCs recommended here are higher-end configurations, so your Windows 7 PC should be capable for years to come. But many users don't need such high-powered PCs, as they focus primarily on Web usage, email, and basic office productivity -- all tasks that a mid-level PC today can handle for years to come.
The Fujitsu LifeBook S752 should top such users' list. The 14-inch screen, 2.6GHz Core i5, 4GB of RAM (expandable to 16GB), rewritable DVD drive, and 500GB hard drive is more than sufficient. The ports are basic: one Ethernet, one USB 3, one eSATA/USB 3 combo, two USB 2, one MicroSD, and one DisplayPort (you supply your own video adapter).