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You can take the drive out and temporarily attach it to a working pc to salvage the data.
Hard Drive Recovery Tutorial - How To Slave A Hard Drive
You may have to take ownership of the files first: How to take ownership of a file or a folder in Windows XP
. . or, You can use an adaptor like this
: or an external enclosure like this
or, you could use Ubuntu - this would eliminate the need to physically remove the Hard Drive.
You can get it from here: Download | Ubuntu
Step #2 on that page shows you how to create the USB/CD.
Once you boot into Ubuntu, (choose the option where it runs off the USB/CD) you can use it to copy your files from the Windows Partition to an external hard drive (Note:
Do not copy anything to the Ubuntu Filesystem as it will not be saved on shut-down)