If you'd rather run Linux, or you've bought the parts and want them put together properly, I do that too. I've run Linux servers for years and build my own machines.
Installs and upgrades of Ubuntu, Kubuntu, Mint and friends; rescuing a Linux system after a failed update; dual-boot with Windows; custom PC assembly and GPU/PSU/cooling swaps; and getting a NAS or home server behaving.
Online, by phone or email. Tell me the symptoms; I'll ask the rest.
Same or next day where possible, at your home or office.
You'll know the price before I start; tap your card at the end. If it comes back within 14 days, I come back free.
Tell me what's going wrong and when suits — I'll confirm a time, usually the same or next day.