MalwareBytes Anti-Malware
Besides simple spyware protection, MalwareBytes Anti-Malware (MBAM) removes other things like trojans, rootkits and viruses. MBAM scans your system very quickly and without causing as much slowdown as some other anti-virus solutions. Only one things missing from the free version are the scheduler for scans and updates, meaning you will have to do both manually.

SuperAntiSpyware Free Edition
Like MalwareBytes, SuperAntiSpyware guards your computer from spyware and most other types of malware. The careful scan allows you to scan each and every part of your hard drive, removable media, memory, registry and anything else you can think of. It also features unique start-up and shut-down protection to protect you during those susceptible actions.