Have a Samsung galaxy tab 2 , 7.0" ...3113 .....4.1.1 want to root need to know what to down load to my pc and how to due it..thanks

Thanks @Nash..Will it work for my galaxy tab 2? Just to make sure.

There are 2 Iroot version for you to choose.You can follow these instructions to root it.
http://www.iroot.com/how-to-articles/root-samsung-galaxy-tab.html

Step 1:

1. The following procedure works for Samsung Galaxy Tab 2 P3113 smartphones.
2. Make sure your device have at least 80% battery power.
3. Make sure USB Debugging is enabled

Step 2:

1. CF-Auto-Root to root P3113UECLK7 firmware [Filename: CF-Auto-Root-espressowifi-espressowifiue-gtp3113.zip]

2. Odin 3.07 [Filename: Odin307.zip]

Step 3:

1. Extract Firmware zip file and you will get a .tar file and some other files.
2. Extract Odin zip file and you will get Odin3 v3.07.exe along with few other files.
3. Switch off your Galaxy Tab 2 P3113
4. Now, put the Galaxy Tab 2 P3113 in Download Mode by pressing and holding the Volume Down key and Power button.
5. Then, a warning message appears, press the Volume Up key to continue.
6. Now run Odin3 v3.07.exe as an Administrator because Admin privileges is required to complete the process smoothly.
7. Now connect your Galaxy Tab 2 P3113 with your PC using USB cable.
8. Then a message will arrive under Odin's message box in the bottom left saying "Added!!"
9. Select these files in Odin at respective tabs from extracted firmware folder:

• Click the PDA Button, and select the CF-Auto-Root-espressowifi-espressowifiue-gtp3113.tar.md5 file.
  

10. In Odin window, make sure Auto Reboot and F. Reset Time checkboxes are selected. Also, make sure that Re-Partition checkbox is selected, only if you are using a .pit file.
11. Double check everything that we mentioned in Step 9 & Step 10 above. Now, once satisfied hit the START button to begin the flashing process.
12. Once flashing completed, you will see a PASS message with green background in the left-most box at the very top of the Odin. The tablet will then automatically rebooted and soon you will see the Samsung logo. You can then unplug the USB cable to disconnect your device from computer.
Congrats! Your Samsung Galaxy Tab 2 P3113 running P3113UECLK7 Android 4.1.1 Jelly Bean firmware is now rooted. You can now install apps that require root permission.