UBCD4Win!

Hiren's BootCD (HBCD) is a completely free bootable CD that contains a load of useful tools you can make use of in a variety of situations like analyzing, recovering and fixing your computer even if the primary operating system can not be booted.

Hiren's Boot Disk was great for the Windows XP, Vista, and 7 era of computing. Unfortunately it was discontinued in 2012, with FalconFour's Ultimate Boot CD following it's demise in 2013. So I took on the honor of bringing forth an up-to-date boot disk for everyone. MediCat USB aims to replace the discontinued and dated Hiren's Boot Disk. It is geared towards modern hardware, and follows the Ubuntu release cycle with a newly-updated release every 6 months.

Knoppix is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive. The decompression is transparent and on-the-fly.Although Knoppix is primarily designed to be used as a Live CD, it can also be installed on a hard disk like a typical operating system. Computers that support booting from USB devices can load Knoppix from a live USB flash drive or memory card.There are two main editions of Knoppix: the traditional Compact Disc (700 megabytes) edition and the DVD (4.7 gigabytes) "Maxi" edition. Each of these main editions has two language-specific editions: English and German.Knoppix mostly consists of free and open source software, but also includes proprietary software »

F4UBCD, FalconFour's Ultimate Boot CD, will be the last Boot CD you'll ever need.

Rescatux is a GNU/Linux rescue cd (and eventually also Windows) but it is not like other rescue disks. Rescatux comes with Rescapp. Rescapp is a nice wizard that will guide you through your rescue tasks.

From the site: "I have been a field service technician for many years, which means that I am out on my own fixing computers on-site and don’t always have the support of a shop or colleagues to help. Field service work requires one to be able to quickly and routinely get the problem diagnosed and solved right the first time, otherwise it means another trip back out to a client’s location.

Windows Preinstallation Environment is a lightweight version of Windows used for the deployment of PCs, workstations, and servers, or install, deploy, and repair Windows while it is offline.

Grml provides an excellent selection of software packages for installation, deployment and system rescue. You'll get sysadmin's favourite tools. Choose between a x86 and an amd64 version depending on your needs or just grab the multiboot ISO grml96, providing 64bit and 32bit ISOs in one single place.

Barts PE Builder helps you build a BartPE (Bart Preinstalled Environment) bootable Windows CD-Rom or DVD from the original Windows XP or Windows Server 2003 installation/setup CD, very suitable for PC maintenance tasks.

Active@ Data Studio (Live CD) contains a set of both desktop applications and a bootable image for booting up any system into a DOS or Windows environment. Whether you need to perform data recovery, data imaging, or to securely erase data, Active@ Data Studio allows you to run the utilities from within Windows or to boot a system up from a self-contained boot environment.

The Windows Assessment and Deployment Kit (Windows ADK) is a collection of tools that you can use to customize, assess, and deploy Windows operating systems to new computers.

Hoek’s Tools is a vast collection of portable utilities for the management, diagnosis and repairing of computer problems, recover lost or deleted files or cracking passwords. There are literally hundreds of utilities. Hoek’s Tools can be used as a collection of portable repairing and diagnostic utilities which can be run from within Windows without installation. To do this insert prepared CD or USB drive and select a utility from the HT program launcher menu. To open launcher menu you need run \htools.exe »

PartitionGuru is a partition management and data recovery program. In addition to traditional MBR partition table, it supports GUID partition table on GPT disks also. The free version is not able to convert a dynamic disk to a basic disk.

DLC Boot 2016 is a rescue disk that is used as a Recovery CD. The point is that if you are having problems such as Windows can not boot, missing MBR, want to format the hard drive, remove viruses and so on, you can simply use the DLC Boot 2016 to resolve the issue. DLC Boot 2016 is also able to backup / restore windows partition, create partition windows, entering a locked Windows passwords, and much more!