i had dual boot windows 7 (160 gb) and linux boss os(100 gb ) , since i dont need linux i installed a new copy of windows 7 by formatting but from then the linux partition is neither visible in windows 7 os nor its is asking me during the boot time .i used "Darik's Boot And Nuke" formatting tool thought it would remove the linux partition but it removed oly windows 7 os . currently i am unable to boot any os . when i tried to install new os it shows oly 150 gb .. some body help me out in removing that invisble LINUX patition so that it can be used in windows 7 .ALSO MY DVD WRITERS DOESNT WORKS ,I HAVE OLY USB PORTS ...

Try to install Win7 on the 150 GB, after that, you have the Disk Management in "Computer Management" (aka MMC). With that, you can reformat the disk. With Windows, you're better of in a two partition setup anyway, one for Windows, page file and programs (The things you'll need to reinstall anyway if it goes down in flames) and one for your personal files (That you just can't reinstall that easily).

BTW, sorry to hear you're moving away from Linux... Just business or are you turning your system into a gaming computer?

I am a great fan of linux but this problem occured in my friends pc .he doesnt have that much knowledge in linux .

---------- Post added 01-13-14 at 09:03 PM ----------

I couldnt find the linux partition in disk utility management ...

I'm going to suggest a slightly different approach. Burn a live CD. If it were me, I would prefer with gnome desktop - but only because I want to use the gnome gui partitioner: Gparted. Using Gparted, redo your partitions any way you want to. If you want to wipe the whole disk - do it. If you want an ntfs partition for the whole drive - do it. I don't find the KDE partitioner as flexible and useable.

Once you have the partitions blown away and rebuilt - do the re-install. If you want to save something off the old installation - use the live CD to copy or backup whatever you want to backup - to a usb SDD drive, or a USB HDD, whatever.

That will fix you up, no problems, no headaches. Just burn a live CD. Use a distro you are familiar with, so you can install Gparted from the distro repos in case the live CD doesn't already have it on.

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@hiero yesterady i referred some notes in internet , they said that linux partition can be deleted from disk management utility window so i installed win 7 . but now it is not showing in windows 7 disk management window .is it possible for me not to format the hardisk once again ?!

What you have is a partitioning issue, not only formatting. I already uninstalled Linux on some PCs myself (I rather sell them with the OEM Windoze, because I'd say a person's Linux system is a very personal thing, just like a car or a flat - you just gotta tidy up before selling them. Windows on the other hand... well, guess.), and it showed up in all of the cases there.
Just to clarify, you do use the MMC (Microsoft Management Console)? And neither it nor the setup is seeing these partitions? That's really odd. I recommend doing what hiero2 said: Get a live CD system (Nearly all bigger distros have a live CD these days) and use its partition editor. That way, you can reformat those old Linux partitions to NTFS whithout touching your new Windows partition - you keep Windows and everything installed on its partition, but you get to use those other ones.
Are all those partitions on the same hard disk, btw? That might be the reason you can't see them, if they're gone in the live CD as well...

@linuxsist and hiero2 . i ll try out gparted live soon and let u ppl know .. thank u so much guys :-) :-)

GPARTED couldnt find that linux partition alone . :-( what shall i do !! ??

How would a live-cd work if op has no dvd-rom <@ ? I guess gparted live-usb would do the trick. please post the output of:
sudo fdisk -l

Yeah - a "live USB" would do the trick. Maybe I misunderstood - I thot the OP said his dvd didn't write, not that it didn't work. I read back - it's not exactly clear, but it does sound more like he doesn't have a cd/dvd drive at all. Hmm. Live usb then.

I've never seen gparted not see the whole drive(or drives) available - unless the bios wasn't detecting the drive properly. If the bios doesn't pick the drive up, then gparted isn't going to. Outside of that possibility, this problem may be beyond me. More info might be helpful at this point.

i used live usb oly ...
i have attached the snapshot of my screen ... need any other info !! ??

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from what I can see, your first hard drive has about 150gb.

Try the drop-down box towards the top-right in Gparted, the on that currently says "/dev/sda". You should see another entry for "/dev/sdb" that is approximately 100GB.
In Windows I imagine you're doing similar and looking in the wrong place.
Edit: As alluded to above to open disk management in Windows you need to run "diskmgmt.msc" (without the quotes). I swear I used to find it through a menu somewhere but either hte version of XP I have in a VM is somehow crippled or I've forgotten where to look.

@273 i checked out the drop down list box which u are saying , in which i could find oly the pen drive and 150 gb partition (which is displayed currently ). .��

Then it sounds very much like you have a hardware issue with your second hard drive. That is, of course, if there is a second drive in there and you're not confusing having a 150GB drive partitioned into a 50GB partition and a 100GB partition.
Perhaps have a think about the steps you took to install Linux or even open the case if it's a desktop PC so that you can be sure you know what you are looking at?