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Windows 7: Windows 7 fail to boot after ubuntu installation

16 Feb 2012   #1

Windows 7 Pro
Windows 7 fail to boot after ubuntu installation

I've installed Ubuntu 11.04 on my notebook ASUS U36SD. It worked perfectly fine for 4 months.
Recently, I decided to install the last version of Ubuntu, 11.11. From now, Windows 7 doen't want to boot: It freezes at the boot screen. I tried to use the repair mode, but it failed. I also tried the safe mode. It still does't boot and freeze when loading CLASSPNP.SYS.

Please, do you have an idea about how to solve this problem?

My System SpecsSystem Spec
16 Feb 2012   #2

Windows 7 Pro
How to unhide a NTFS partition?

After an installation of ubuntu, my C: partition, where Windows 7 is installed is corrupted.
From linux, I can read it and access the disk, but the windows recovery environment doen't detect it.

I think that it is because my partition is also hidden (0x17)
Do you know how to unhide this partition from linux, or to make a chkdsk on it from the recovery environment?
My System SpecsSystem Spec
17 Feb 2012   #3

Windows 7 Professional

One easy way to repair/recover nearly any type of partition is to use testdisk on Ubuntu. You need to run it from xterm as superuser. Just follow the prompts and it should fix your problem.
My System SpecsSystem Spec
17 Feb 2012   #4
Microsoft MVP


Keep in mind that GRUB can corrupt Win7 beyond repair in almost any case, and Dual Booting is best done with Win7 installed last: Dual boot Ubuntu-Win7
Dual-Boot Windows 7 and Ubuntu in Perfect Harmony

That said you can try to repair Win7 by marking it Active then running Startup Repair - Run 3 Separate Time. Partition - Mark as Active (Method Two)

If it won't show an installation to repair, open CMD line to run: bootrec.exe /fixboot and bootrec.exe /fixmbr then see if it will show installation. If not you may have to start over and dual boot correctly.

It is always best to use EasyBCD to dual boot the two on same HD to keep GRUB off Win7 partition, and use separate HD's if at all possible booted only via the BIOS boot order OR one-time BIOS boot menu key.
My System SpecsSystem Spec

 Windows 7 fail to boot after ubuntu installation

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