Before you do anything else, back up that HHD to an external media - also check for hidden partitions as you may well have the restore software hidden there. click here
The hard drive bay is not designed for this purpose. Removal and reinsertion of the hard drive may damage the hard drive connector. SONY VAIO Link does not recommend this operation, cannot offer any support on a non standard hardware configuration and any physical damage is considered out of warranty. Please contact VAIO Link for further information concerning out of warranty repairs.