You can recover your files using a live linux distro to recover your files.
On another computer download the Mint Cinnamon iso file.
https://linuxmint.com/edition.php?id=302the
Download Rufus
https://rufus.ie/en/
Attach a USB flash drive and run Rufus. Select MBR as a partition scheme. Leave all boxes as checked. Press the select button and browse to the downloaded Mint iso file. Press start. All data on the USB flash drive will be wiped so backup any data on the USB flash drive.
Attach the USB flash drive to your Vista HP. Tapping Esc at boot should give you a boot menu. Select the USB flash drive. At the Mint desktop click on the folder icon in the lower left of the desktop. You should see a HDD icon in the left pane. Click it and browse to your important files which should be in the USERS directory.
Attach a USB HDD or flash drive. An icon will appear on the desktop and a file manage window will open. If not click the USB icon on the desktop. You can copy and paste files between the HDD and USB device. Don't select move, only copy.