MS Office 2007 (Excel 2007) and MS Excel 2003

Can I instal and run 2 versions of Ms Excel on the same PC? How?

My PC and Laptop both have Windows XP and MS Office 2007 (Excel 2007) already installed [which is a later version of Ms Office package] but now I have got a “project assgnmt” which only seems to work with MS Excel 2003.

My PC has got 2 internal HDD and I have 500GB Ext usb HDD. 1gb ram.

Can I instal and use Ms Excel 2003 from my 2nd HDD or my EXT HDD while I still have MS Excel 2007 on my 1st Bootup HDD?? Wont I have any conflict with MS Office 2007 (Excel 2007) and MS Excel 2003 as the later is an older version?

Please Help!!