When I noticed a disk drive problem early one Saturday, I decided it was time to replace an aging cabinet filled with aging disk drives. A significant performance boost was a welcome extra. In Short Circuits: Microsoft would like you not to use cleanup applications such as CCleaner because they might damage the Registry, but now they’re offering a CCleaner-like app called PC Manager. • Editing Environment variables is much easier today than it was 40 years ago with EDLIN on an early DOS computer, and an addition to Microsoft’s PowerToys makes it even better.