Windows 10 start button not working and I also did a programming challenge

On windows 10 and needed some anti virus, installed Kaspersky, windows key no longer works and cannot click on any of the buttons except shortcuts. I may need another way of getting to applications other than win key and type.

Solution: https://www.techmesto.com/fix-start-menu-broken-windows-10-technical-preview/ 

Or run this in power shell

Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage 

-DisableDevelopmentMode 

-Register "$($_.InstallLocation)\AppXManifest.xml"}

Challenge 238 Easy consonants and vowels

package com.company;
import java.util.Random;
import java.util.regex.*;

public class Main {
    public static void main(String[] args) {
       String inputString = "CVcvcvcc";
        char[] consonants = "bcdfghjklmnpqrstvwxyz".toCharArray();
        char[] vowels = "aeiou".toCharArray();
        Random random = new Random();
        Pattern pattern = Pattern.compile("[^vcVC]");
        Matcher matcher = pattern.matcher(inputString);

        if (matcher.find()) {
            System.out.println("Invalid character in input");
        } else {
            StringBuilder output =  

            new StringBuilder(inputString.length());
            for (char letter : inputString.toCharArray()) {
                switch (letter) {
                    case 'c':
                      output.append(consonants[random.nextInt

                      (consonants.length)]);
                      break;
                    case 'C':
                      output.append(Character.toUpperCase 

                      (consonants[random.nextInt(consonants.length)]));
                      break;
                    case 'V':
                      output.append(Character.toUpperCase 

                      (vowels[random.nextInt(vowels.length)]));
                      break;
                    case 'v':
                      output.append(vowels[random.nextInt

                      (vowels.length)]);
                      break;
                }
            }
            System.out.println(output);
        }
    }
}

Originally did this with multiple ifs' and it looked bloody awful.