Hello and Welcome to LinuxQuestions,
Please don't use terms like Urgent in your title or post, it's only urgent to you, not to us who are all volunteers here putting in our own time to help out other users with their Linux problems/questions. Your question could be answered in various ways but since you seem to have no knowledge of Linux let me point you to what Google provided in under a second:
Access ext2/ext3 file systems from XP
You could also try booting a LiveCD with Linux to retrieve your data.