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.

If you are running too many apps on a low-end PC simultaneously, it is likely to cause lags in Roblox and other games. Roblox games require a good amount of system resources to run properly.

Meta Quest 2 and Quest Pro users can now download the Roblox Open Beta, allowing them to create and engage in new Roblox experiences.

Close other apps and see if that helps your case. Make sure voice chat is actually enabled in Roblox: The feature only works for players who are over 13 and have a verified phone number.