Hi micdowli3,
Yes, a system recovery will do the trick as this will install the 32Bit version of the OS including all sony drivers and utilities. you will however lose all personal data and third party applications. Personal data can be restored after recovery assuming you have a backup but any third party applications will have to be reinstalled.
If the recovery partion is still intact you can run the recovery process by tapping F10 at boot - this should open the Vaio Recovery Utility. Otherwise you will need the recovery disks assuming that they were created and passed on to you.
To check whether there is a recovery partition open Control Panel > Administrative Tools > Computer Management -expand Storage and click Disk Management. For Disk 0 there should be a EISA partition without drive letter (this is the hidden recovery partition) plus the usual C drive.
Rich