File system cleaner and registry cleaner for Windows 7

Question

Please recommend software to replace CCleaner for Windows 7.

Here is the only functionality from CCleaner required (it's fine if your recommendations do more):

1. File system cleaner
   • Remove temporary files
   • Remove junk files from previously installed applications
2. Registry cleaner
   • Fix obvious registry errors (without breaking anything)
   • Remove obsolete entries

I prefer it to error on the cautious side, rather than be over-aggressive.

Must be gratis for personal use. Open-source preferred, but not required.

I'm fine if it takes two separate applications to meet these requirements.