You can rediscover the interfaces, but if that doesn't work, the quickest way would be a direct SQL query into the database. One thing do to would be to create an interface custom property that could be a yes/no property called Properly_Set. Leave all the ones that are incorrect unchecked then you can do something like this.
Update Interfaces Set InBandwidth = 10000000, OutBandwidth = 10000000 Where Properly_Set = 'False'
This should get the bandwidth set for you.
Please note that you may need another 0 for this.
Putting Knowledge Into Motion
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Update also Interfaces.CustomBandwidth column to 1 otherwise the Bandwidths could be overwritten with polled ifSpeed.