Hello Yannis Welcome to the Seven Forums!
I'm afraid that older model is a bit too old for seeing any 64bit support. The information found in the USA-Cannon Service & Support only shows the following since 64bit drivers
were never written for it.
No. This product is not supported in Windows 64-bit Operating Systems.
No. This product is not supported in Windows 64-bit Operating Systems. It is designed to work on Windows 32-bit operating systems only.
The search result page from their knowledge base is seen at Canon U.S.A., Inc.
Apparently that particular model series was discontinued before Vista arrived being the second desktop version to offer the 64bit Windows other then Server 2003 which might by chance have had a 64bit driver
on the other hand that might work without any guaranty however. If the older server version saw any or one close enough to work you might get away with using that. Otherwise you will simply need to go with a much newer model.