For anyone interested, I just did an installation for someone who couldn't fix this problem (Can't find unicode character property definition via main->a or a.pl at unicode/Is/a.pl line 0).
The solution is VERY simple.
Your paths don't need to be \\ or \ and neither do your perl paths.
So for example if perl was installed in your C: drive the perl path would be C:/perl/bin/perl and not C:\perl\bin\perl
Secondly paths like C:\\Inetpub\\www.domain.com\\cgi-bin\\admin can be C:/Inetpub/www.domain.com/cgi-bin/admin
This erradicates the error.
The solution is VERY simple.
Your paths don't need to be \\ or \ and neither do your perl paths.
So for example if perl was installed in your C: drive the perl path would be C:/perl/bin/perl and not C:\perl\bin\perl
Secondly paths like C:\\Inetpub\\www.domain.com\\cgi-bin\\admin can be C:/Inetpub/www.domain.com/cgi-bin/admin
This erradicates the error.