I have tried so many combinations and still I am having an issue with my triple boot setup. The computer is an older model Dell laptop (XPS Gen 2). Initially I tried creating a single primary system partition (C of 3.5 GB (due to the fact that I am installing Vista and 7 via USB key and the partition needs adequate room) followed by an extended partition containing 4 logical drives. This is all on a single 250 GB hard drive. C: is flagged as "active". Installed XP to D:, Vista to E: and 7 to F:. The XP/Vista dual boot works as it should, but when I add 7, it gets through the first stage of install and then upon reboot throws up an error about winload.exe code 0xc000000f. I have never been able to accomplish a triple boot on this laptop. I suspected given that the BIOS is Dell's, that may be an issue, but I am not sure. If I install all primary partitions, XP on c:, Vista on e:, 7 on f: I get XP and Vista in a proper dual boot, but then installing seven breaks XP. I get an ntoskrnl error. I ideally want to be able to use the "System Reserved" partition if possible (as opposed to installing XP on C. I have been attempting to get this to work for days now and each time I have an error, I have used Easy BCD to make sure that the MBR is correct and it always is. Please help!!