Read moreQ: What if I'm having technical issues with Vanguard?
These days, Vanguard suffers from a lot of attribution bias, and the majority of bugs we see actually come from external sources that are difficult to lock down. One of the largest perpetrators recently has been the distribution of pirated software that toggles a registry option ("DevOverrideEnable") and allows "different" versions of key Windows files to be loaded into all running processes. Now, we can't say exactly what your intentions would be for doing something like this (wink), but what we can say is that Vanguard doesn't like when corrupted windows files are loaded into VALORANT—we use a great many of them to do tampering checks ourselves. We'd also recommend that you be careful what you turn off windows defender for, because it's doing what it says on the tin (defending windows).
Anyways, issues can arise, but please submit a ticket. We'll get you sorted.
I might have ...
There'll be a modal going out in 14.8 (currently on PBE fwiw) that will check your PC to let you know if it's ready for Vanguard. If you get an alert that something isn't right, there's troubleshooting steps and a player support link that can help you get things set up in time for launch, which is currently planned for 14.9.