Windows 7: Cant boot from win 7 ungrade disk

Try writing the ISO to stick as given then reboot, tap ESC or F9 key to see if you can find stick to boot under USB, Removable or HD's - you may need to expand them.

Did you burn the DVD using ImgBurn at 4x speed?

Please be thorough in working through the steps given and in your replies if you want to get this fixed.

yes I burned the last 2 at 4x. and I will try the USB thing now

If it fails to boot from flash unplug the DVD drive data or power cable to make sure it's not interfering. All other HD's and peripherals but the target HD should also be unplugged.

iS the microsoft office store download tool OK to use to copy the files to the USB

Should be. However it does sometimes fail while the Universal tool hasn't yet.

OKay d/cd the power cable to everything but the HDD and when trying to boot from USB only a blinking dashing in top left screen shows.

I'm sorry but this is still indicative of bad install media. Please download a fresh copy of the latest official installer w/SP1, burn to DVD or write to stick using Windows 7 USB-DVD Download Tool.

Try setting HD first to boot in BIOS setup, then trigger DVD or flash stick to boot using HP ESC or F9 one-time BIOS Boot Menu key given on first screen.

If this fails again, move on to reset BIOS to defaults. While in BIOS set SATA controller to AHCI. Save and exit.

Next wipe the HD by slaving it in another computer to run Diskpart Clean Command or boot free Partition Wizard bootable CD which will autostart to Wipe from Disk tab.

If this fails test the HD using maker's HD Diagnostic extended CD scan.

If install still fails test your RAM - Test with Memtest86+.
Remove all but 2gb RAM to try install. Next swap RAM sticks.

As a last resort move HD to another machine to install, before moving back SysPrep to move HD to another computer.

When installing Upgrade version to a wiped HD, leave Product Key blank during install then afterwards do the quick registry workaround here to activate: Clean Install with a Upgrade Windows 7 Version

OK def got further this time.. middle of progress I get:
STOP: c000021a (fatal System error)
The initial session process of system process terminated unexpectedly with a status of
0x00000000000 (0xc0000221 0x001003a8).
The system has been shut down.

Which step of install were you at? Clean Install Windows 7

Which of the troubleshooting steps I gave you in my last post had you completed yet?

Just the burning of the fresh install and it just loaded more than before