Problems with new build

[rupnok]

Hi,
Components:
CPU i5-2500k and stock cooler
Mobo Gigabyte Z68xp-ud4
Ram G skill sniperDDR3-1600 8gb
PSU PCP&C 910W
SSD OCZ Vertex 3 120gb
HDD Seagate barracuda 7200rpm 160gb
No Graphics cards yet using the intergrated for now
win 7 x64 pro

POSTs fine and all RAM is recognized, but when I go to install the OS from a flash drive I get "Bootmgr is missing". i checked the flash drive by using it on another computer and it boots fine. The activity led on the flash drive does come on when it is attached to the new build. When I try with a usb dvd drive to install via disk I get a "The file may be corrupt. The file header checksum does not match the computed checksum" I've searched quite a few sites and everything I have tried has not worked. Even flashed the BIOS 5 times (Mobo shipped with BIOS f1 now it has f5). Haven't built a rig in about 10 years. Thanks for any help.

 

[Willasap43]

What os ?

 

[rupnok]

Sorry, Win 7 x64 pro

 

[Willasap43]

Legit ?

 

[rupnok]

you mean the os? Yes, got it at the educator's discount and dl'ed via MS store.

 

[rupnok]

Update: Got memtest86 to boot via usb and double checking RAM now.

 

[rupnok]

Did i post this in the wrong section? Not getting alot of attention/answers.
RAM checked out fine.

 

[rupnok]

Figured it myself. Put a working HDD into the build and it booted up fine. Ended up that the HDD on which I wanted to install win7 was not initialized.