hi all, I need some help from you guys. I intentionally installed two os on my laptop (windows 7, nd ubuntu 32 bit 12.10 desktop version) so, the problem is I was kind of fooling around with my Pc nd installed ubuntu on same pc for several times, nd then deleted two of them(but their virtual images were left behind in the hard drive unknowingly), and after that I again installed ubuntu's same version with the help of universal usb installer (on an another drive other than C: drive). and now when I restarted my lappy for running ubuntu, it didn't respond according to what I expected, and its black screen showed me an error with (multiple active partitions / error os loading). I don't know how to deal with this situation, please help me out. My first preference is to run both Os but if it's not possible then I want atleast one of them to work properly (ubuntu is my first choice). If its not possible to run any of the os again on this lappy, then I would love to format my whole hard disk.