Install Java JDK
Java SE Development Kit 7u3 Downloads
For rooting I will tell you:
1) Download SUT LR
2) Download New Android Firmware for viewsonic with rooted.
( after downloading Extract it)
3) Install SUT LR in XP and Connect Mobile to PC(make sure usb debugging is ticked in the mobile).
4) Open SUT LR and Click Next-> Select the firmware.nb0 (options Leave "none" Next--> It will take some time Click -> Finish.
5) It Will automatically reboot the device.
6) Install Root Explorer.apk (download it from 4shared.com)
7) Open and goto system/app
8) click options select the app and delete.( but be careful before deleting ,if some appications are dependence ,It may crash , So Take a backup with root explorer and delete.
9) Only Drawback is can 't have multiple Ringtone for both sim card.
10) It Works Fine .