Windows 7 - Multiple memory errors after clean install of windows7 help!!

Ok guyshere is my problem. I am building a budgetpc. I bought new in box an AMD X3 450 and a asus m4a78lt-mle mobo, and 4gb of DDR3 1333mhz memory Kingston. First off out of the box the processorposts as a amd x4 b50. Not sure if they packaged the wrong one or the mobo is reading wrong. I dont want to pull the cpu fan back off tok read the cpu. I did a clean install of Windows 7 ultimate. After install finished i went to install drivers, well the mobo drivers cd was not in the mobobox so i planned on installing usb wireless nic and downloading drivers. This is where the problem starts. When i click on the exe install file i get ,a cmd box popup that says program to big to fit into memory. So i cant install any drivers, i downloaded alla the mobo drivers from asus on a thumb drive and copied over to the hard drive. Tried to run those files and i get the same error message. So i reinstalled Windows 7 this time the 64bit version and this time i still get the same error but on other exe files i get a message sayinng that they are not 64 bit files. Even though i downloaded the 64bit version. So im not sure what is up. All parts were new in box. Any help is very appreciated.

Best thing to do if you suspect the motherboard is misreading a chip is to check for bios updates for it.
Cpu compatibility is a common bios update.