RegSeeker is free and besides being a Registry cleaner, has a
handful of other Registry-focused utilities. They include a keyword
finder, a way to examine installed application Registry entries,
assorted histories (for instance, Internet Explorer and Start menu
items), and Startup entries, as well as a way to tweak about 24 XP
settings. The Registry cleaner is confusing because it has an "OK!"
button and a dangerous option: "Auto Clean," something I encourage
you to avoid. There's little help, though RegSeeker warns that to
backup the Registry, make sure to check mark "backup for deletion."
There's no automatic restore feature; you'll need to find the saved
.REG file and click on it.
On my production PC, RegSeeker picked up 1108 problems.
Unfortunately, the program offered no help determining which of the
errors needing deleting; it also didn't provide categories, such as
invalid path or shared DLL, in order to help me decide if it was
safe to delete. RegSeeker isn't for novices.