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 win7 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 win7 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.