Excel crashes while logging on

Hi Guys,

We are trying to upgrade to office 2010

we have installed the BPC client on office and when trying to log on to it the excel crashes.

we have BPC 7.5 NW SP10, MS .NET 1.1/ .NET 4, EI 8, office 2010 SP1 (32bit), and window 7 (64 bit)

Any ideas why its crashing

Thanks

FS