Hi gujady18. Are you having trouble opening the application itself or a company file? If the application itself will not open I highly recommend checking out the article on running the QuickBooks Repair tool this article goes over a few things you can try before resorting to a clean install of the QuickBooks Desktop 2017.
If the steps in this article are unsuccessful in opening up the application, you will need to perform a clean install of QuickBooks Desktop. To do so just follow the guide provided in this article about clean installing QuickBooks Desktop.
There's always the chance you're having trouble with opening a company file, in that case we have an article on what to do if you can't open you company file that will get you on the right track. Please let me know if you need anything else. I want to make sure you get back up and running as soon as possible. And have a good rest of your day.