(O)utils pour Windows

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Use Defraggler to defrag your entire hard drive, or individual files - unique in the industry. This compact and portable Windows application supports NTFS and FAT32 file systems. http://www.piriform.com/defraggler

Defraggler - File and Disk Defragmentation - Free Download

http://www.piriform.com/ccleaner

CCleaner - Optimization and Cleaning - Free Download

CCleaner is the number-one tool for cleaning your Windows PC.
cron4win is going to be a windows service written in C to execute some code, or perhaps even run a process, at certain times or at intervals. About SourceForge.net:

WinCron

http://wincron.sourceforge.net/
VisualCron is an automation tool and task scheduler for Windows. VisualCron provides advanced file/script execution, file transfer (FTP/FTPS/SFTP/SSH/HTTP), email, archiving (7z/zip/tar/gzip), XML handling, Active directory tasks, encryption (PGP), desktop macro recording, send/receive emails, system control (Hibernate,Standby,Restart,Logoff), SQL execution and monitoring are standard functions of VisualCron. Above all, the interface of VisualCron is very easy to use. http://www.visualcron.com/

VisualCron - advanced task scheduler and automation tool for Win