.NET Framework creates another account on your PC that is only visible if you go to User Accounts in the control panel. This account can be deleted and wont cause any problems to .NET Framework. This means you will no longer have to log on and can play BVE. YAY!!
The best way to know where to stop accuratly in BVE 4 is practice. Using the jump-to feature is also good, since it puts the train at the correct stopping position, and you can then looks how things are in relation to the cab, for example at one station with the HST you want to stop with the bottom of the cab window just touching the first TPWS trainstop grid. Remember though that what works for one train will unlikely work for another. The advantage is that in BVE 4, most stations give more leaway when it comes to stopping position than BVE 4 did, since it allows the developer to specify the distance forwards and backwards, but this also means that they can make you have to stop even more accuratly if they want aswell.