The following items are security tools that I have loaded on my computer, naturally do not take my word for it. You download all at your own risk of course. I cannot guarantee how these will operate on your computer nor your level of computer knowledge to use the tools well, however I have found them to be safe, reliable and user friendly.

Windows Defender
AVG anti-virus software
Avast Antivirus
Adaware spyware software
Sygate Firewall
CCleaner
XPRepairPro [this one is not free]
Mozilla Firefoxbrowser
McAfee Site Advisor
Incredimail Junk Filter Plus
Spam Assassin

Then there are the regular tasks that I perform on a weekly or bi-weekly basis:

Open each of your Spyware/Adware programs (Microsoft Defender and Adaware). Run a full scan on each at least once a week.

Open AVG and update plus do a full computer scan every day. It does this automatically at 8am AWST so do it yourself each day if you do not turn on computer before 8am.

Go to Start. Go to Control Panel. Go to Internet Options. Go to General tab. Delete all Cookies. Delete all Temporary files. Do this once a week. If you use Firefox you may also need to manually go to Tools, Options and Privacy plus Advanced to show and clear their cookies, private data and to empty the cache.

Open the CCleaner and click Analyze, then delete those extra files.

Go to Start. Go to Accessories. Go to System Tools. Go to Disc Clean Up. Perform a full disc clean up. Once a week.

Go to Start. Go to Accessories. Go to System Tools. Go to Disc Defragmenter. Perform a full defrag. Once a week.

Back up all your files/folders onto CD'