Come on now cheerup, it's ok!
Here's what you do...
Connect that 8gig hard drive to the 80gig drive, by connecting the 8gig drive as a slave.
80 - Master (will already be set like this)
8 - Slave (you will have to change the jumpers on the back, little fiddly things they are. If you look on the drive itself. The shiny side will tell you there postiton.)
Connect this drive to the other one using the second connector on the cable that the other drive is using.
When you go into XP...the 8gig drive will be seen and you can drag and drop your files across.
You need a second power connector.
This should work, unless there is sever damage to the drive.