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Manufacturer's sites

Because searching for the manufacturer's support site often results in third-party sites (that you do not want to visit).  Here are some of the popular actual manufacture sites. 

Manufacture Home Support: Help, drivers and software
Acer http://us.acer.com/ac/en/US/content/home http://us.acer.com/ac/en/US/content/support
Asus http://www.asus.com/US/ http://www.asus.com/us/support/
CyberPower http://www.cyberpowerpc.com/ http://www.cyberpowerpc.com/support/
Dell http://www.dell.com http://www.dell.com/support/
Epson https://epson.com/usa https://epson.com/Support/sl/s
Fujitsu http://www.fujitsu.com/us/ http://www.fujitsu.com/us/support/
Gateway http://www.gateway.com/gw/en/US/content/home http://www.gateway.com/gw/en/US/content/support-overview
Hitachi http://www.hitachi.us/ Good luck from their main page
HP http://www.hp.com http://www8.hp.com/us/en/drivers.html
Lenovo http://www.lenovo.com/us/en/ address too long but this is the link
Sony http://www.sony.com/ address too long but this is the link
Samsung http://www.samsung.com/us/ http://www.samsung.com/us/support/downloads
Toshiba http://www.toshiba.com/tai/ http://www.toshiba.com/tai/support.jsp
Other hardware    
ATI (video) https://www.amd.com/en https://support.amd.com/en-us/download
AMD (components) http://www.amd.com/en-us http://support.amd.com/en-us/download
Brother http://www.brother-usa.com/ http://www.brother-usa.com/support/
Gigabyte (components) http://www.gigabyte.us/ address too long but this is the link
Intel (components) http://www.intel.com/ https://downloadcenter.intel.com/
Konica Minolta https://www.konicaminolta.com/us-en/index.html https://www.konicaminolta.com/us-en/support/index.html
NVidia (video) http://www.nvidia.com/ http://www.nvidia.com/object/support.html
Western Digital http://www.wdc.com https://support.wdc.com/
Microsoft www.microsoft.com https://support.microsoft.com/en-us
See also Windows Updates
     
Common antivirus manufacturers
Avast https://www.avast.com/ https://www.avast.com/en-us/total-support
Avira https://www.avira.com/en/avira-free-antivirus https://www.avira.com/en/support
AVG free.avg.com https://support.avg.com/?l=en_US
Bitdefender http://www.bitdefender.com/ http://www.bitdefender.com/support/
Kaspersky http://www.kaspersky.com/ http://usa.kaspersky.com/support/
McAfee https://www.mcafee.com/consumer http://home.mcafee.com/root/support.aspx
Norton http://us.norton.com/ https://support.norton.com/
Panda http://www.pandasecurity.com http://www.pandasecurity.com/usa/support/
Symantec (business) https://www.symantec.com/index.jsp https://support.symantec.com/en_US.html
Trend Micro http://www.trendmicro.com/us/index.html http://www.trendmicro.com/us/about-us/contact/
Vipre http://www.vipreantivirus.com http://www.vipreantivirus.com/support.aspx
Other common sites you may want
Adobe www.adobe.com  
     
Java www.java.com  
MalwareBytes (cleanup utility)  https://www.malwarebytes.org  
OpenOffice.org https://www.openoffice.org/  
     

Intel offers an even more comprehensive list of manufacturers: http://www.intel.com/support/oems.htm