Microsoft
The worlds leading software manufacturer's site. Here you can find a huge support knowledgebaseas well as all the latest software updates.
www.microsoft.com

Tucows
A huge site with tons of downloadable software for you to try out. There is software available for all operating systems is covering many different categories.
www.filehippo.com

Internet.com
This site covers all areas of IT ranging from web design to software development. A great site to find solutions to your IT problems.
www.filehippo.com