It looks like ravi09 is using a bit of Warez to activate Vista, by injecting into the bootloader/MBR/whatever. Daz Loader for 7 shows a similar message to what has been posted here.
I've used my fair share of warez, and still do, but whatever ravi09 is using to boot is NOT SUPPORTED, nor should the members of reboot.pro provide any help unless and until he does things legitimately. I'm well versed in how to install warez, and how to fix related issues, but I NEVER post for warez help on forums or elsewhere. We cannot and should not be responsible for advising him on the use of pirated software, and any troubles he may run into related to its' use. Things could get worse, after all.
@ ravi09: If you really insist on not paying for Windows, then at least get yourself a Volume Licensing (as opposed to retail) copy of something like Vista Enterprise, then activate with a KMS activator like Microsoft Toolkit (not sponsored/created by Microsoft, mind you). Obtain your ISO however you like, then hash its' checksums against the MD5/SHA-1 values provided by MS, then either burn it to DVD or create Bootable USB, then reinstall. This will ensure that you have a clean copy of Windows. I've found that ISOS released by MSDN/TechNet are best for this. This will not modify system files, and your bootloader will be 100% official. KMS activation is fully supported by MS, although you will be entitled to no support, since you obtained your VL copy without permission/payment and without meeting the qualifying terms of use tied to VL software.