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Paymee is fully compatible with both 32-bit & 64-bit Windows (XP / Vista / 7) however Paymee will not work with 64-bit Excel 2010.  Paymee is fully compatible with 32-bit Excel 2010 (default installation is 32-bit).

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Per Microsoft, the 64 bit Office is recommended for "Excel expert users who work with Excel spreadsheets that are larger than 2 gigabytes (GB)". Source: http://technet.microsoft.com/en-us/library/ee681792.aspx

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If you dont work with spreadsheets that are larger than 2 gigabytes, you may want to consider getting the 32-bit Excel.

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Microsoft Office 2010 usually comes with both 32 & 64-bit Setups.  A full UNinstall of 64-bit Office is needed to install 32-bit Office/Excel.