Sen2Cor L2A_Process.bat error in standalone version in Windows 8

Hi everyone!
I am repeatedly getting an error when trying to batch process L1C data to L2A using the command prompt. The initial installation appeared to be succcessful:

Yet I consistently get the following error after a few lines of processing done on my .SAFE file and the processing stops:

Any ideas why this is happening and how to fix it?
Thanks in advance!