Might have deleted kernel, but haven't shut off computer yet

My /boot was full and I couldn't update, so I tried to get rid of unnecessary files, but I think I might have deleted some things I shouldn't have. I don't know if grub or grub2 works, or whether or not I can still boot into windows. However, I haven't shut off my computer yet so I was hoping I could fix everything now. What can I do?

I used this command:

for akernel in $(dpkg -l 'linux-' | sed '/^ii/!d;/'"$(uname -r | sed "s/(.)-([^0-9]+)/\1/")"'/d;s/^[^ ]* [^ ]* ([^ ])./\1/;/[0-9]/!d'); do sudo apt-get purge $akernel; done

uname -r

3.13.0-66-generic

ls -lhA /boot

total 29M

-rw-r--r-- 1 root root 1.2M Oct 7 12:34 abi-3.13.0-66-generic

-rw-r--r-- 1 root root 162K Oct 7 12:34 config-3.13.0-66-generic

drwxr-xr-x 5 root root 1.0K Dec 17 21:41 grub

-rw-r--r-- 1 root root 19M Oct 30 18:15 initrd.img-3.13.0-66-generic

drwx------ 2 root root 12K Feb 7 2015 lost+found

-rw-r--r-- 1 root root 173K Mar 12 2014 memtest86+.bin

-rw-r--r-- 1 root root 174K Mar 12 2014 memtest86+.elf

-rw-r--r-- 1 root root 175K Mar 12 2014 memtest86+_multiboot.bin

-rw------- 1 root root 3.3M Oct 7 12:34 System.map-3.13.0-66-generic

-rw------- 1 root root 5.6M Oct 7 12:34 vmlinuz-3.13.0-66-generic

du -h /boot

du: cannot read directory ‘/boot/lost+found’: Permission denied

12K /boot/lost+found

2.1M /boot/grub/i386-pc

9.0K /boot/grub/locale

2.3M /boot/grub/fonts

6.7M /boot/grub 36M /boot

df -h /boot

Filesystem Size Used Avail Use% Mounted on

/dev/sda3 361M 180M 159M 54% /boot

Open the terminal and type:

sudo apt-get install --reinstall linux-image-generic  
sudo grub-install /dev/sdX
sudo update-grub

...where for

/dev/sdX

Since it isn't done during execution of the sudo grub-install command, running sudo update-grub after the install will ensure that the GRUB menu is up-to-date.