Vista Booting problems

Hi Guys,

I'm seeking some help.
On my work pc (i'm self employed) I have a problem with Vista booting up.

It has been working great, however this weekend, went to boot up as usual and it doesn't. It auto restarts during the startup screen. tried safe mode - hangs on something called crcdisk.sys

This morning I've tried booting from Vista DVD - go through the repair startup - which is VERY slow. it is now (for the last two hours) still "searching for problems"

I'm worried sick, as this is my only work pc and it contains all my tax/invoicing etc etc - I have not backed up for about 3 months (I know how stupid) but I'm so worried that I can't get this info.

Any advice would be most welcome.

thank you

Jules