Hi Tym, welcome.
Some antivirus software might give you warnings and even quarantine the game executable and not let you run the game.
As Konstantine has said, we can assure you that there is no reason for concern as this is a known issue raised by some antivirus and firewall programs and therefore a false positive.
To solve this, you can add the game as an exception in your antivirus settings. It will depend on your version of Norton, but try this if you have Norton 360 (from here):
Launch "Settings" from Norton 360 UI -> Click "Antivirus" Link -> Click "Scans and Risks" Tab
Under "Exclusions/Low Risks" you will see "Items to Exclude...." options.
Based on the category of the file please select the relevant option and add the file to exclusion list.
You can also try (from here):
Click on Computer Setings > Scan Exlusions > Auto-Protect Exclusions, then enter the File Name there.Or (from here)
Go to Settings > AntiVirus > Scans & Risks. Click Configure next to "Items to Exclude from Auto-Protect, SONAR and Download Intelligence Detection". From there, you can remove the items/files from the exclusion list.
Hope this helps. Let us know if you were able to solve the issue or if you need further help.