Antivirus

AVG antivirus program. Very Good product that I have used.
AVG Full version free 30 free trial of antivirus and antispyware program. Very good to use to clean a system and then uninstall or pay to keep if it is worth it to you.
Avast antivirus program. Very Good product that I have used.
AntiVir antivirus program

Online-scanners normally find but don't clean

F-Secure also cleans
Housecall from Trend Micro online virus scanner
PC Pitstop
Kaspersky virus and spyware scan
Panda Security scan

Firewall

Comodo Free Personal Firewall and the PC Magazine review
Zone Alarm free firewall

Spyware

TrendMicro now manages HijackThis and others. It is a wonderful tool but you need to make sure to get rid of only the things that should not be there. deleting good things can make your system inoperatable.
For those that would rather pay the money than spend hours searching through logs and hacking your registry a highly accepted product is CounterSpy by Sunbelt
One designed to remove crub from new computers PC Decrapifier
Ad-Aware : Should be running if your computer is connected to the internet and UPDATED at least weekly and check the date!
SpyBot : Should be running if your computer is connected to the internet and UPDATED at least weekly and check the date! You can use the additional add-ins if you need them.
SUper Anti Spyware : The free version is a scanner only. Install and rignt click on the icon in the system tray to see options.
CCleaner Cleanes out old files and leftover junk in your registry
Microsoft one that is a free Beta : Seems to work pretty good. Need to have a valid version of Windows-XP running. They came out with it since you can not update to service pack 2 if spy-ware is running on your PC
Bunch of other Official nasty spy software removal : Use if the above two always find something.
Spywareguard Another one that does several different tasks but they say it may interfer with other products.
Spywareblaster One from same place but a little more focused of a product that should work with others. Free or $9.50/yr for autoupdate
Spy-bot manual removal instructions for many of the new nasty products.
I am Not a Geek Spyware removal Guides.
Post your HijackThis logs here for automated information
Spyware info forum More spyware info.
Information about latest spyware
How to unregister programs to allow their removal.

Aurora/nail.exe removal

Rootkit Killer to detect and remove Rootkits UnHackMe

Windows not Updating

Error 0x80240020 with updates download but do not install. SensLogn missing If the above doesn't help, try clearing software distribution folder following these directions
Try running from the command line "ipconfig /flushdns"

computerhelparticles.com has a bunch or useful articles on various problems.

Blocking host file

Host files can be used to redirect you to nasty sites. It can also be used to redirect you away from them by using a custom hosts file.

Computer Training

Misc computer training
FreeSkills Free online computer tutorials
Learn That Free online computer training
Woody's Office Portal Microsoft Office helpful information
Newbie.org learn about the internet and electronics

Software / Utilities

Replicate files from one computer to another
Hide file folders from others - Free
Scribus Open-source professional page layout desktop software- free; multi platform
Gimp Image Manipulation software for image retouching, composition and image authoring - Free GNU
Irfanview Image software to view, convert, optimize, scan, print, slideshow creation and batch processing.
Roboform Password management, Web form filling
Password Safe another Password management, Web form filling
PDF995 creates Adobe pfd files
SiSoftware Sandra provides information about hardware and software
Audacity Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

Replay Music is a unique streaming music recorder that captures MP3 files from any streaming source
LogMeIn-Free Easy remote access for home and personal use.

Cool Stuff

Myth TV free PVR project.
Build a home Media Server
Transfer Large file with YouSendIt
Remote desktop control, secure and don't have to create an account