If Roblox is not opening or working correctly on your PC, it could be due to an ongoing server issue that is preventing you from launching the app correctly. So, make sure Roblox servers are not down.

For some Roblox players, voice chat is absolutely essential. Here's how to fix voice if it's not working in the Windows version of the game.

If you are asked to continue installation without flag settings in Roblox, first clean Roblox App Data and see if it helps. More fixes here.