And now back to the thread at hand and the original poster, marenkar:
You should avoid wubi for anything other than a simple test drive. It wasn't meant for more than that. That's what dual-booting, VM's, etc., are for.
As far as grub goes, and multiple OS's, each time you tried to install another OS did you get an updated grub menu? You should be able to create separate partitions for each OS and as long as update-grub was run you should see them all. Just remember partition limits and go for logical (extended) partitions for everything after your 1 partition for Windows and a partition for some Linux install.
Dave
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