Did you check the latest stable version of the livecd 0.4.1-2?
Anyway you can use the alternate boot option, using VESA graphics driver and resolution no more that 1024x768. It works on nearly every modern system.
The version 0.3.4-7 is quite old. Perhaps some operating system update caused a problem. Anyway, you don't give any info about the source (or probable source) of the boot problem. How this started? Did you make any partition change? any software installation? any worm/virus problem?
It isn't normal that not even the xp installation cd doesn't start. A hardware problem (BIOS, ram, cd/dvd drive, motherboard/controller, even cables) is always possible. A rather easy way to check is by using a Linux live cd like Knoppix. If Knoppix boots up, then there is a problem with the xp installation or boot up. Then, you can even access the hard drive in question and are able to copy content in another internal or external drive.
If Knoppix fails to boot up, you can suspect some hardware issue. Of course, check internal cable connections, as well as the motherboard backup battery.
*** It is highly recommended to backup any important files before doing resize/move operations. ***