I have an HP e-Vectra/e-PC C10 Ultra Small Form Factor desktop from my childhood, I'm sure that counts since it's technically a "Vectra" (it's in its name). On December of 2005, my dad's workplace was downsizing their computer inventory, so he brought home two HP/Compaq USFF desktops (the other one was a Compaq EVO D510) for me and my brother to use, those were my first desktop PCs. In 2010, after they've been superceded by my Athlon 64 desktop, they were starting to suffer from hardware failure, so I've disassembled both computers and did foolish things to some of their parts (don't get mad at me, I was a little kid at the time).
In 2014, I've managed to acquire another e-Vectra to restore the one I parted out, so now it's in working condition again. A year later, I've obtained another Compaq EVO D510 USFF to restore my old one, so now I've got both childhood desktops restored.
The e-Vectra has an Intel Pentium III 933 MHz CPU, 256MB PC-133 SDRAM (the maximum due to it only having one RAM slot coupled with the limitation of the i810 chipset), 20GB IDE hard drive, DVD-ROM/CD-RW Combo drive (taken from a dead Gateway laptop since the original CD-ROM drive was dead), and integrated Intel graphics which it's unfortunately stuck with since there are no expansion slots due to it being an Ultra Small Form Factor desktop, so it's not suitable for gaming beyond 2D games, which is OK since this was intended to be an Office PC back then. It currently dual-boots Windows NT 4.0 Workstation and Windows 2000 Professional SP2.