Emsisoft Emergency Kit is a collection of standalone security programs and scanners that can be run from a USB key, bootable CD/DVD, or from within Windows Safe Mode without having to download and install a full security product.  This program is very useful for infections, such as Ransomware,  that cannot be removed while the infections are active or while logged into Windows.  

OTL, or OldTimer ListIt, is a tool that is used to diagnose a computer for a possible malware presence and to provide system diagnostics information that can by someone working on a computer.  When run, OTL will scan your computer for a variety of information and then generate a report with a tremendous amount of information about your computer's hardware, programs, files, and running environment.

HijackThis is a program that can be used to quickly spot home page hijackers and startup programs that you do not want to start automatically. This program is a not anti-virus program, but rather a enumerator that lists programs that are starting up automatically on your computer as well as other configuration information that is commonly hijacked.

Hosts-perm.bat is a batch file that will reset the permissions for the Windows HOSTS file.  In the event that you attempt to delete or modify the HOSTS file and receive a message stating that you do not have permission, you can use the Hosts-perm.bat to reset the permissions so that you can properly access it.

ListParts is a small utility that will create a log that contains a listing of all the hard drive partitions on your computer, which can then be posted on the forum that you are receiving help.  This tool is useful for diagnosing rootkit infections that create additional hidden partitions on your computer.

VT Hash check adds a context menu item for all files allowing you to quickly search VirusTotal.com for matching files and their corresponding malware reports.

GrantPerms is a small portable tool that can be used to check permissions or unlock multiple files and folders. It is useful in cases where malware locks security files and system files and prevent them from running even after the malware is removed.

MiniToolBox detects Internet connection issues due to broken or hijacked LSP, proxy settings, and problems with network adapters. It can also be used to detecte search redirections and router hijackings.

Farbar Recovery Scan Tool, or FRST, is a portable application designed to run on Windows XP, Windows Vista, Windows 7 and Windows 8 in normal or safe mode to diagnose malware issues.

Farbar Service Scanner allows you to diagnose network connectivity issues due to corrupted or missing Windows services.