1) Hvilken router er det?
2) Kan andre enheder komme på netværket?
3) Er det WPA eller WPA2, eller andet?
Det kan være Vista ikke understøtter det, mangler måske drivere. Har du andre PC'ere der kan komme på det trådløse?
Forresten bør du ikke bruge Vista, da Microsoft ikke længere supportere den... Se mere her:
https://www.express.co.uk/life-style/science-technology/779937/Windows-Vista-End-of-Support-Date
"After the April 11th (2017) deadline passes, your computer will still work as usual.
However you will be more vulnerable to security risks and viruses – especially if your PC is connected to the internet.
That's a problem. Especially if you store sensitive or personal information on your computer.
Also, as more hardware manufacturers continue to updated and optimise their devices for more recent versions of Windows, expect to come across more apps and devices that no longer work with Windows Vista.
That could become a real headache – and could leave you unable to connect your digital camera, printer, scanner, and more."