"No wubildr" error when trying to boot Wubi

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http://askubuntu.com – I installed ubuntu 12.04 LTS inside windows 7 using wubi, but in the operation system selection menu when i try ubuntu it displays: Try (hd0,0): NTFS: No wubildr (even though it does exist in C:\wubildr) Try (hd0,1): NTFS: (here it hangs, it cannot load grub) When i choose windows in selection menu it boots normaly. I realy do not understand what is the problem!!! (HowTos)