yeah i get that also when it updates sometimes, reboot the device and see if it starts normaly, if it doesnt, dont be alarmed.
Download the firmware from advent website here http://www.myadventvega.co.uk/softwareImage_v1.09_Vega_Final.exe
turn of the tablet (holding down powerbutton for 6-10 seconds) then hold down backbutton, press powerbutton for two seconds, release powerbutton (PC should not make a connected USB Device sound) and then release backbutton.
Now you can run the 1.09 image to restore the device to normal state
here are the official step by step for the original firmware (directly from advent)
also, if you are not to eager with android market, just do the 1.09 update, skip modaco´s and download google maps from google directly m.google.com/maps (there you will get the correct url for your country)
not sure how to get reader for android and spotify without market tho :S