There are several things that you can do to solve this problem. You can try to uninstall and then install the application again. Also, it is advised that you download and install it from the following official web page.
Also, you can restore your system to a point where the VAIO Care software is still working. If none of these suggestions works, you can try to perform a Drive Recovery for your C: drive. By doing this, you will wipe all your data from the hard drive bringing it to the factory condition.