Sorry for any confusion, If you have only just installed the OS I would suggest that a re-install would be the best solution.
Although the problems that you may encounter if leaving as is would most probably be minor, there is no guarantee that one of these minor problems could cause you personally a major issue - we all use the PC differently.
If you check the Tutorials section here you will find various options you could try to keep inconvenience to a minimum - especially if you have installed a lot of programs.
Things such as a repair install or upgrade may re-set the system drive to C: but I cannot confirm this, from experience.
The option of a complete fresh re-install is always going to be the best option but only you can decide if this is viable for yourself