Error (0x8007045D And 0x80070002) While Installing Windows 7 Ultimate 64bit

i've recently decided to reinstall windows 7 64bit because my computer started freezing up occasionally while browsing, playing games or even watching Internet videos... the freezes would pass after a few minutes and the computer would recover and start up/shut down would take a long time as well. so i thought that reinstalling windows might work as i haven't done it in a long while. but i encountered a problem while installing windows 7 64bit, i receive these errors (0x8007045d and later after trying a few things it changed to 0x80070002 both times it stated something about files missing or being corrupt) while on the "extracting windows files" section of the setup.

i've done a clean install every single time and formated my hdd (seagate barracuda 7200.10 320gb) but got an error every single time but at various %'s (once it went up to 70% other times it would get stuck as soon as 5%). i've tried switching ram's, switching dvd drives, disconnecting my gpu but nothing seems to work... has my hdd died? or perhaps my mobo or cpu is acting up? i burned my windows 7 iso's myself via imgburn - i've used the slowest possible burn speed (x2) and did it multiple times but every single dvd gave same error. also i've tried multiple iso's and downloaded them multiple times as well to confirm they didn't get corrupted while downloading.

my specs:
os: formatted hdd right now but previously i used windows 7 64bit
motherboard: intel bearlake g31 (i think, not sure... its such an old mobo)
cpu: intel core 2 duo 3.3ghz
gpu: geforce 9600gt - tried removing but didn't work
ram: ocz 2x2gb 800mhz ddr2 - tried switching to an exact same pair from another computer but it didn't work
hdd: seagate barracuda 7200.10 320gb
dvd-rom: not sure but i tried two different ones, both producing errors