[wubi] Ubuntu 12.10 Installation problem on windows XP

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http://ubuntuforums.org – i am trying to install Ubuntu 12.10 on Windows XP using wubi.exe. On startup i am getting two options 1. windows xp 2. ubuntu when i choose windows , it starts in normal way. But when i choose ubuntu , it asks for user name and password. After entering password , system accepts it. But only ubuntu coloured screen comes but no icons. i also get some message like "application compaz" failed. Not sure about this message. Here i am giving my system configuration : Model: PI845GLM Pentium 4 2267MHz (L1 cache: 8.00 Kb, L2 cache: 512.0 Kb) Ext.clock: 133 MHz AMIBIOS 070010 04/02/ (Hardware)