Hi all, thanks in advance.
I am repairing a laptop that was infected with a virus by reinstalling Windows 7 64bit after formatting.
Laptop specs, lacking because i didn't write it down before reinstalling:
465gb sata drive (the only hd on laptop)
intel dual core processor
previously installed with Windows 7 enterprise 64 bit, infected with virus with pop up ads and occasionally fail to boot.
What I did:
Don't have windows 7 bootable DVD, so I created a bootable USB with windows 7 enterprise 64 bit from Microsoft as a trial for IT developers. Booted to installation screen, detected 3 partitions on the SATA hd, and I tried to reformat all partitions into one. So I deleted the partitions into one unallocated space, and create a new partition with only 8mb unallocated space on the whole drive.
"Windows cannot be installed to this disk..." error shows up, and I restarted to BIOS diagnostics, which cannot recognize hd, so I booted to windows 7 setup from the USB again, opened command prompt (shift + F10), and did the following (X is the boot drive from usb):
DISKPART>LIST DISK \\disk
0 shows up as the empty hd
DISKPART>SELECT DISK 0
DISKPART>CLEAN ALL \\succeeded
Then I restarted to Windows 7 setup, and since I completely cleaned it, now it doesn't have any partition, so I created new partition again with 8 mg unallocated space left.
Open command prompt again
DISKPART>SELECT DISK 0
DISKPART>LIST PARTITION \\partition
1 created with correct size showed up
DISKPART>SELECT PARTITION 1
DISKPART>FORMAT FS=NTFS \\succeeded
Hoping this would settle the matter, I unplugged everything from the laptop, including the battery, and pressed and held power button to reset BIOS, fire up the sucker, and went to BIOS diagnostics and performed a quick hard drive test, which shows to be healthy.
Booted up to Windows 7 setup again, open command prompt to check partition status
DISKPART>LIST VOLUME \\shows
volume 1 is C: with the healthy NTFS 465gb partition
DISKPART>SELECT VOLUME 1
that it's writtable, installable, and healthy (no to all parameters that would prevent windows installation)
exited command prompt, went back to windows setup interface, it still wouldn't install windows 7 onto that partition, which is recognized with labelled name at this point.
Since this laptop was purchased in 2010, and it's a HP BIOS, there should be no need to turn on AHCI (and I can't anyway, BIOS doesn't have any option besides boot order and diagnostics), I don't think it's good idea to install XP first as a stepping stone, because of the SATA compatibility issue, so right now I have no idea how to install Windows 7 on a clean laptop
Any help is appreciated!!!