my ubuntu 11.0 wont boot up

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http://askubuntu.com – Long story but it began on windows 7, it would slow down, then freeze, then crash, i would restart the computer and sometimes it would say "no OS detected" so i recovered it. when i did that i was still running into problems, so i just loaded ubuntu as a dual boot. when i did this my computer ran smoothly, i didnt have a single problem, until i shut it off, now my windows 7 is non-existent and ubuntu wont boot, it gives me an option to go into recovery but when i get there it wont finish booting, it gives a few lines of errors and gives me something of a command terminal which says (initramfs) (HowTos)