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where do I get windows 7 driver for handycam DCR-PC101E?
Windows 7 supports iLink connectivity without additional drivers. You should be able to transfer to something like Windows Movie Maker using an iLink cable.
USB Streaming will not be supported in Windows 7.
Have a look at the Support Pages for your model here: -
http://support.sony-europe.com/dime/camcorders/sd/dv/dv.aspx?site=odw_en_GB&m=DCR-PC101E