It has a "set it and forget it" feature similar to Diskeeper, here based on "idle time" instead of "screensaver", and it can stop if the CPU goes over a certain threshold. Free, but it seems to use a little bit more of memory than DK. I think it can be recommended

various interesting utilities

"It is a CD that contains all the updates found on the Windows Update Website, including Service Pack 2, with a small standalone programs that run the updates in the order specified by Microsoft according to the order set by Microsoft."

Recovering photos from a corrupted flash card

for DVD movies

Alternative to the standard Windows Add / Remove module

including the famous Process Explorer

"eliminates the need to manually reconfigure your network settings when you move your desktop/laptop computer to another location. (...)can configure your IP settings, proxy settings, mapped drives, default printer, wallpaper, and screen resolution (...)"

adds "Always On Top", "Minimize To Tray", "Priority" and "Transparency" sub menus to all top level system menus..

• The directory list, which resembles the tree view of the Windows Explorer but is sorted by file/subtree size,
• The treemap, which shows the whole contents of the directory tree straight away,