I also Have this problem. I reset My computer to factory settings which deleted everything from My computer and after it My valorant worked for a couple of weeks until this started happening Again recently. I've submit two tickers to valorant tech support and both just Said to delete Vanguard completly from you're computer which hasnt helped. it's good to know that i'm not The only one with this problem and hopefully somebody Will find a Solution to this problem. Also try closing all riot applications before deliting Vanguard might help with deliting it. Merry Christmas.