windows 7 with service pack 1

we have came a cross few machines not working after SP1 setup . it says some of the files are missing
is that the normal thing can happen after installation of SP in windows 7 . some are comment in the web similar thing happen during the setup power failed  

please advice the best way to handle this
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You have given very little info about your PC's, environment etc. Are these new installations on old PC's? Are the disk healthy (test them using the disk manufacturer's diagnostic utility). Is the RAM OK? test that using memtest86+. Those tools you'll find on the UBCD:

Is your Windows 7 installation DVD still OK? is SP1 integrated on that DVD or are you installing SP1 after you have installed Windows 7?
Also clarify "it says some of the files are missing" - as detailed as possible: who (what entity/program) says what (exact message) when (after doing what/on starting what).
curAuthor Commented:
this is not the fresh installation . As you said some of the PCs will go back to 2 to 3 years old . sp1 separately installing on the existing windows OS 7
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If this isn't a fresh installation, then why isn't SP1 already installed? SP1 for Windows 7 has been available for many years, and it should have been installed very long ago, as Windows 7 without SP1 has long lost m$ support (it ended on April 9 2013). That would mean those PC's haven't received any Windows updates since then and are therefore terribly out of date and insecure.

With such PC's your only sane option is to do a fresh Windows 7 installation, then when the installation has finished, first install SP1, then run all Windows updates.

But before doing that make sure the disks and the RAM is fine by using the tools I mentioned earlier.
What are you using to install SP1?

" some are comment in the web similar thing happen during the setup power failed  "
Power failure during installation almost always causes a corrupt installation.

Format and reinstall Win 7 from scratch unless you have a legitimate Win 7 SP1 disk.
curAuthor Commented:
we are using the downloaded SP copied in the target PC land run  . power failed make sense and avoid . issue is some of the machine after successful setup giving issues
often you have to install first some updates, before it accepts the SP1
did you put the system on automatic updates, and let it search?
that will get you started
As I already mentioned, do a clean Windows 7 installation, then install SP1. Your PC's have been running without SP1 for much too long. Also run the disk and RAM diagnostics before you start.

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Windows 7

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