Scanning for spyware and adware isn’t enough to protect your PC. You also need to take preventative steps to ensure that unwanted software doesn’t come back. One effective way to prevent spyware and adware from returning is to install an anti-spyware prevention program such as:
SpywareBlaster and SpywareGuard are excellent, free programs from JavaCool. I recommend installing and using both, as they protect your computer in different ways. SpywareBlaster “inoculates” your Internet Explorer browser against the installation of unwanted spyware and adware from the internet. SpywareGuard actively monitors your PC and prevents spyware infestations. Both are easy to install and update.