Ok here it goes.....I did a complete build a few months back. I installed Vista 32 bit OEM and everything is fine. When I found out 32 bit still had the RAM cap, I was bummed cuz I have 4gig installed. So I decide to go 64 bit. Now here is my problem. I have tried everything I can think of to install 64 bit, and to no avail, so I ask for assistance in this matter. I purchased a 64 bit OEM cd. I can not for the life of me get this to install. I get the boot from disk at startup, and it runs through loading files, then after that initial go, it just loads the 32 OS off my HDD. I have gone as far as formatting my second HDD, used for Raid 1, unplugged my HDD that has 32 bit loaded on it, but still no avail. I am at a loss, any help, suggestions, reasons to why, would be much appreciative. I thank all of you in advance who assist me on this.