To help out those who would help you please include as much detail about the problem as you can. State which os your using, 32bit 0r 64 and either basic,home or ultimate. Include your system spec as well as any changes you may have made recently.
This will allow the answer to be found much more quickly...

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i am using vista home 32bit hp pavillon.b4 that hapen i try to remove anti virus but it said that i remove it already but still there...i remove it again follows that the system restart and the blue screen w/out display comes....until now i try pressing f8 and select safemode,only "windows configure" txt i found out.earlier while i booting,screen display "windows\system32\kernel is missing.dont know if that the exact txt.can u help me

Sounds like you need to re-install vista

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thats on my mind and i try that using recovery disk (hp).before i do that and no problem and no question.i dont know what happen now...did not open recovery system window.how can i format in that situation.after loading files...and the blank blue screen appears and that's it.

File: WINDOWS\System32\ntoskrnl.exe
Status:0x000000f
Info:Windows failed to load beacause the kernel is missing, or curropt

On a surprising number of occasions, we have had people using the Contact Us button because they are having a problem with their computer. This is not what contacting us is for. Contact Us is for reporting a problem with the website itself such as a registration problem, reporting spam, or proposing a link exchange to a similar computer related website.

It never ceases to amaze me that time and time again someone is using this button because they are having a problem with their computer, when the entire website is a forum where you can post your problem. Does it make sense to try and get a few people who administer this site to try and answer you, when you can have your question read by potentially tens of thousands of people?

Please think about what you are doing the next time you are using this button, since there is now a zero tolerance policy if it is abused.

It has occurred to me that some people may not have the knowledge of how to use a forum website or care to take the time to carefully communicate their problem on a keyboard. For those who do not have the patience:

How to contact Microsoft if you cannot get an answer to your problem:

Visit Microsoft Help and Support

Contact Microsoft

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Visit the Windows 7 Forums @ http://windows7forums.com