Need a CX65 (Cable) modem driver for Windows Vista 64bit

Please help !

I have a SIM CX65 USB modem cable for use with my Siemens C75 phone.
I need a working Siemens DCA-540 driver for Vista x64 (64bit) or other SIM
CX65 USB modem cable compatible x64 (64bit) driver.

Some technical driver information:
PHONE: Siemens C75
CABLE NAME: SIM CX65

All I have is the following working drivers for use with the
SIM CX65 cable:
CX65 Cable Driver for VISTA 32 bit:
Code:
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CX65 cable Driver For WinXP & win98:
Code:
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EXTRA INFORMATION:

I have until now got no answer when trying to contact the USB Data Cable
manufacturer here:
Code:
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I have until now got no help when asking benq-siemens which tok over the
Siemens mobile unit part of Siemens before it declared itself bankrupt here:
Code:
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Please let me know where to find an working driver for Micrososft windows vista 64bit.
Or maby some will convert or develop the Vista 32bit driver to a working
Vista 64bit driver.

PS: My German is not good so please write in English ! Thanks.