One of the most useful pieces of software for netbooks that don't have DVD drives is Alcohol Soft's Alcohol 120% and 52%.

Basically, Alcohol 52% creates a virtual DVD drive on your computer, you simply mount DVD images onto its virtual drive from a memory stick and then the computer sees it as a DVD drive.

Alcohol 120% enables you to create a virtual DVD drive as well as make DVD images for copying to a memory stick or mounting on a virtual DVD drive. You can also burn DVD images to blank DVDs if you have a DVD writer.

Note that the virtual DVD drive will play CD, DVD and Blu-ray disc images.

Alcohol 52% is free, since it only mounts images. Alcohol 120% is available as a 15 day trial and is available half price 39€ instead of 70€.

Whenever you switch to another antivirus program or upgrade an old one, sometimes files are left behind that prevent you from doing so. 

So here are the removal tools for the most popular antivirus programs on the market.

AVG have been up to their old tricks to get people to buy a copy of their free antivirus. 

You need to remove the old copy before installing the new one or you may find your computer doesn't boot afterwards.