One problem you hit with older notebooks is proper driver support for 64-bit. But you'll have no problem at all. You notebook has factory support for the following systems.
Genuine Windows® 7 Home Premium 32-Bit
Genuine Windows® 7 Professional 32-Bit and 64-Bit
Genuine Windows® 7 Ultimate 32-Bit and 64-Bit
Genuine Windows® 7 Professional with Downgrade Rights Service to Windows® XP Professional
Genuine Windows® 7 Ultimate with Downgrade Rights Service to
Windows® XP Professional
Genuine Windows Vista® Ultimate 32-Bit
Genuine Windows Vista® Business 32-Bit and 64-Bit
Genuine Windows Vista® Home Basic 32-Bithttp://i.dell.com/sites/doccontent/shared-content/data-sheets/en/Documents/latitude-e6410-e6510-specsheet.pdf
Just download the right drivers after you install the OS.
(p.s. Why would you want to upgrade to 64bit -- adding memory ?)