Computer Cleaning Tools
CrowdInspect
CrowdInspect is a small 237KB host-based process inspection tool utilizing multiple sources of information to detect untrusted or malicious network-active processes. CrowdInspect associates the connection entry with the process that is responsible for that activity and also records details of any entry that is associated with a remote IP address and maintains a chronological list of those accessed.
CrowdInspect uses VirusTotal, Web of Trust, Malware Hash Registry to analyze Processes
http://www.crowdstrike.com/crowdinspect/
FixExec
FixExec is a program that is designed to fix executable file associations for the .bat, .exe, and .com file extensions. If the program detects any of these associations are missing, changed, or hijacked, the settings will be set back to the original Windows defaults.
http://www.bleepingcomputer.com/download/fixexec/
Server Monitoring
http://www.eventsentry.com/downloads/select-edition
Useful Resources
http://www.thewindowsclub.com/list-freeware-releases-from-the-windows-club