I also want to add a small bit from my end.
ALWAYS take a back up
(can't emphasize that enough) using ClockWorkMod aka CWM if things go wrong while experimenting.
Rule number one:
DO NOT PANIC!!!!
Turn off the tablet PC and unplug the USB connection to PC.
Try to get back in to recovery by pressing the Volume UP (+) button and power button at same time.
Holding down the volume UP button and simultaneously plugging in the USB cable achieves same result too because the tablet powers itself in this method and goes in to recovery - remember to hold down the volume button down all the while.
Also helps to Backup your device to Cloud in one click using Orange Backup
To know more about Orange Backup - readup at following link:
If you are curious and want to learn more - another way of doing it is very nicely explained in the link below.
How To Backup Your Android Phone’s Boot, Recovery And System Partition Images
Romdump is a very simple program that dumps the BOOT, RECOVERY and SYSTEM partitions to your SDCARD, this will allow a technically minded individual to create a recovery image.
Source: Index of /romdump