windows 7 64 bit

hi on my desktop pc i have 3 large partitions C.D.E.on c drive i have windows xp sp3 home edition.on d partition im running windows 7 ultimate service pack 1.would it be possible too run windows 7 64 bit on my E partition ive done all the checks my pc can handle 64bit i have 3GBmemory[ram] my processor is amd sempron[tm]3000+ 1.80GHz. also can i do a clean install of windows 7 64bit over the top of windows xp any help would be much appreciated

Please follow this tutorial, and 'Delete' C: (where xp is), and install windows 7 64bit to the remaining unallocated space at the beggining of the disk, where c: was previouly. Try to memorize or save the video to your phone...