The wubi installer copied files successfully and asked for reboot. After booting into Xubuntu the flashing logo appeared for a minute. And then the screen looked as if it was trying to show something but could not and flickered and then became dark this continued till half an hour and then I pressed Alt+Ctrl+Del.
I tried all the modes but to no avail, only the last mode with command line was working. But it was not helpful for me becoz I dont know most of the commands.
When I tried "Verbose Mode" as directed by the WubiGuide - Ubuntu Wiki, CTRL+ALT+F2 did not work when the installer stopped.
The computer I use is assembled with Intel pentium 4, VIA chipset and Mercury(Kobian) motherboard.