Launcher crashing and unable to load game

I purchased and initially downloaded minecraft several years ago which my children have been playing on a laptop with no problems. The laptop is no longer in use and so I have now tried to download the game onto a new PC. Since doing this, with the new launcher, it is continuously crashing and unable to load the game. I have seen on many forums that this appears to be a well known issue that lots of people are facing and seems that nothing is being done about it.
Mojang, can you please provide me with a viable fix to resolve this issue, if this cannot be done satisfactorily then I will need to request a refund of the amount I initially paid for the game as it is no longer fit for purpose.