Os installation

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Hai,
i want to install win 7 in my friend government lenova laptop...so i first delete linex os and then i install win 7 but when i delete the old win 7 professional then my installation process was stopped and system restarted....
then laptop shows,
..............................................................................................
GRUB loading.
Welcome to GRUB!

error: unknown filesystem.
Entering rescue mode...
grub rescue>
..................................................................................................
how to solve this problem.........please help me...

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Hello,

Try this 1

It still does contain a linux files. Make sure you have correctly removed the

Linux. Delete the Linux partition entirely.

Good Luck

now i try to boot my OS DVD it was booted but when installation screen appeared
suddenly system restarted....i tried that for 5 times...again and again it was happened ....what i do now....
Please Help Me....
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Hello,
Try this 1
First delete the partitions, create a new partition using a third party tool and format that partition. Then try to install the OS.
Follow below instructions.
1) Click on the below hyperlink "GParted" and download the file.
GParted
Its a live one so there is no need to install into your hard drive. You can find all the instructions
regarding downloading the Live application and how to use it.
2) Regarding the instructions of making a partition, click on the below hyperlink "Info"
Info
If the problem still exists then check your hard drive and RAM. Make sure that your hard drive is free from bad sectors.
Good Luck
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now i use Gparted software to delete all my friend laptop partitions ....now there were no partition in Hard disk....again same problem occurred some times the OS DVD is booted but when installation screen appeared then system suddenly restarted ....some times laptop screen shows this message with loud noise sound continually.....
-------------------------------------------------------------------------------------------------------
Intel UNDI,PXE-2.1 (build 083)
copyright (c) 1997-1998 Intel corporation

This Product is covered by one or mre of the following patents:
US5,307,459, U35,434,872, US5,732,094 US6,570,884, US6,115,776 and
US6,327,625

Realtek PCIe GBE Family Controller Series v2.35 (06/14/10)
PXE-E61: Media test failure, check cable

PXE-MOF: Exiting PXE ROM.
No bootable device -- insert boot disk and press any key
--------------------------------------------------------------------------------------------------------
what i do now....please ...please..please...HELP ME.........
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Hello,
Try this 1
Go to CMOS settings and make sure that your hard drive is detected properly. There must be a problem with the Hard drive. Its not able to detect your hard drive and as a result it's going to network boot. So make sure your hard drive is detected and also check all its connections.
Good Luck
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I Dont know how to check CMOS settings....instruct me.....
help me ...Please...
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Hello,
Try this 1
Click on the below link. You can find all the instructions regarding how to enter into CMOS.
https://support.lenovo.com/fr/en/pagenotfound?item=http%3A%2F%2Fsupport.lenovo.com%2Ffr%2Fen%2Fdocs%2Fyast-3jwkjx
Check your model and then press the corresponding key during the startup.
OR
When you turn ON your laptop at the bottom of the screen you can see a message like
F1=Setup F8=Boot Menu. Just press the corresponding key given during the startup to enter into the Setup mode which will take you to CMOS settings.
Good Luck