The Ultimate Boot CD for Windows (or "UBCD4Win") is one of the newest and most remarkable of these tools -- doubly remarkable because it doesn't run in DOS mode. It runs as a version of Windows, directly from the CD-ROM, and installs nothing on the host computer.
More than fifty freeware utilities come bundled on the UBCD: two CD burning applications for creating CDs from within the UBCD environment; disk- and partition-management and copying tools; defragmentation utilities (including DIRMS, which I have written about in the past); disk-hardware diagnostics (including S.M.A.R.T.-reporting tools); compression/decompression apps; recovery/repair tools for various applications including Outlook Express; spyware/adware/virus scanners/removers; network utilities (FTP, VNC, network scanners); CMOS management tools (including password recovery), and many more. Utilities are continually added.
There are several caveats. First, the user himself must provide a licensed copy of Windows XP. This does not simply mean having a Windows XP CD lying around, but one with a spare license for it as well.
Since using the UBCD4Win counts as creating a separate installation of Windows, the end user must have a license for it. Finally, the process for creating the CD isn't fully automated -- there's no single ISO image one can download. The user has to merge files from the Windows XP installation CD with the UBCD's build files, but there's a tool for automating this part of the procedure. (Once the CD is built, of course, it can be imaged and re-used as needed with proper licensing.)
The Ultimate Boot CD for Windows can be found here
Down in the bayou, Bubba called an attorney and asked, "Is it true they're suin' the cigarette companies for causing people to get cancer?
"Sure is Bubba. But why you asking?"
"Cause what I want to know is, I was thinking, can I sue Budweiser for all them ugly women I've slept with?"