I do some freelance PC repair and I just wanted to share a few links for software that I use when fixing computers that you should visit and get the software provided on each site; as each of them will help you fight off spyware, unscatter your files, and prevent viruses from attacking your computer.

Ad-aware
For ad-aware, CNet.com offers a download link, this software is free to use

SpyBot
The link above will take you to the homepage for SpyBot, choose your language and then download and install. This software is free as well

Avast Antivirus
Download the anti virus software and register for 18 months of free anti virus support. Please follow the install instructions and only install this if you do not already have anti virus protection.

Diskkeeper
This software is a trial download that will allow you to use it for 30 days, if you like it you can purchase the full version. This software is to defrag your hard drive.