Hi cja1987 and welcome to the Sony Users Community forums.

If you carried out a full Recovery using Sony's hidden recovery partition, The camera software should be reinstalled.  Look in 'All Programs' for "Arcsoft Webcam Companion 2".

If you did not use the recovery software supplied by Sony and installed a retail version of Vista, then most third party software cannot be downloaded and will be lost.  This is a licensing restrictions imposed by the software supplier.  I don't think the Sony USA Support website has the same restrictions, so I would have a look there for the model nearest to yours and you may be lucky.