I have a Dell XPS720 that came with Vista Home Premium 32bit and 4 GB of Ram. RECENTLY I installed Windows7 Ultimate 64bit on separate Disk and purchased 4 more GB of Ram.

Now using Windows7 all the time but when I try to install more than 4 GB of Ram I can not boot up into Windows7. ( when it starts to boot into Windows7 it ASKS to start normally or repair...... with normal it quits and restarts and with repair it does nothing and i have to force quit) I can boot into Vista 32bit.

My Question is how can I get Windows7 to use 8 GB of Ram without starting over reinstalling all the programs and settings.

I have been told I should remove the Vista disk and the Windows7 disk and do a single boot CLEAN install of Windows7 and then I would be able use the 8 GB of Ram and the system would be more stable.

But then I would have hours and hours of reinstalling programs and settings.

I found out I can not just delete the Vista Disk because then I get a NTLDRHm... When you try to boot using all 8 it give you trouble? the second 4 Gb you ad in might be bad. Try swaping the sticks around and see if Vista 32 can boot with those sticks. You also might want to run a CHECK on those sticks to make sure they are fine.Thank you but I am pretty sure it is not the RAM or the motherboard.

The computer came with 4 1GB chips and that still works so it is not the motherboard

The new ram is 4 2GB chips and they each work alone on slot 1There's no reason Win7 Ultimate should be doing this...
Did you do a clean install over Vista ? ?No I did a clean install of WIndows7 on another disk.

Dell says some of the boot settings are on the Vista disk.