Here are some freeware downloads that may be used for non-commercial purposes. Please read the companies licensing agreement before installing.

Antivirus

Avast! 4 Home Edition
http://www.avast.com/i_idt_226.html
This is a complete antivirus package for home users. You can download the free demo version which is good for 30 days. If you wish to continue to use it after that time you must register it with the company. Registration does not cost anything.

AVG Free Edition
http://www.grisoft.com/us/us_dwnl_free.php
This is a complete antivirus package for home users. You can download it but must register it to install it.

Popup Stoppers

Popup Stopper Free Addition
http://www.panicware.com/product_psfree.html
This product stops popup windows from appearing while web surfing.