windows only does this check so it can see if there are any damaged areas on the disk that could affect the use of the pc. If there any windows will repair them.
I would say just let it run. just switch on your pc go and make a cup of tea and by the time you get back it should be completed.
This way you can be sure that you will not get crashes and that you can get the most out of the computer. the longer you skip it the longer it will stay there and it will not go until you have completed it
Trust me it is worth the while