Here are links from various sites to help you when you need general or vendor specific information and support:

PC World: 
http://www.pcworld.com/

CNet: 
http://www.cnet.com/
http://www.download.com/

Microsoft:
http://support.microsoft.com/

HP:
http://welcome.hp.com/country/us/en/support.html

IBM:
http://www.ibm.com/support/us/en/

Dell:
http://support.dell.com/

Compaq:
http://h18000.www1.hp.com/cpq_support.html

Palm:
http://www.palm.com/us/support/index.html

BlackBerry:
http://na.blackberry.com/eng/support/

Apple:
http://www.apple.com/support/