CCleaner is a quick and easy to use program which makes your computer faster, more secure and more reliable. CCleaner removes cookies, temporary files and various other unused data that clogs up your operating system.
I use this , Plus I added their Defraggler .
ZoneAlarm Free Firewall blocks hackers from infiltrating your home PC by hiding your computer from unsolicited network traffic. By detecting and preventing intrusions, ZoneAlarm Free Firewall keeps your PC free from viruses that slow down performance, and spyware that steals your personal information, passwords, and financial data.
Thinking about adding this , as I am still on XP an it is like 2 weeks till support ends .
Malwarebytes Anti-Malware 2.0
I am not using this now but have in the past .
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