Puremessage & Exchange 2013 SP1

Since upgrading our exchange 2013 server to SP1 Puremessage started blocking all messages, but saying it was inactive in the management app, after been unable to cure this we decieded to uninstall Puremessage and reinstall

But now get an error during install

Error code 1603 was returned when running

C:\Windows\Syswow64\msiexec.exe ADDLOCAL=ClientInstall, CLientServerInstall, ServerExchangeStore,ServerInstall,ServerMain,ServerAntiSpam /qb /lvoicewarmupx! <log file name>

SETUP_INIPATH=<ini file name> REBOOT=suppress TRANSFORMS=:1033 /i C:\pmex64-401\PL\Sophos PureMessage.msi

The section of the log when the error occurs is as below

MSI (s) (80:3C) [00:35:47:005]: Executing op: CustomActionSchedule(Action=SelfRegSharp,ActionType=1025,Source=BinaryData,Target=PM_SelfRegSharp,CustomActionData=/PM_BIN=C:\Program Files\Sophos\PureMessage\Bin\)
MSI (s) (80:3C) [00:35:47:036]: Creating MSIHANDLE (19718) of type 790536 for thread 18236
MSI (s) (80:B0) [00:35:47:036]: Invoking remote custom action. DLL: C:\Windows\Installer\MSI23FC.tmp, Entrypoint: PM_SelfRegSharp
MSI (s) (80!D8) [00:35:47:052]: Creating MSIHANDLE (19719) of type 790531 for thread 21208
GetProperty('CustomActionData') : [49] = '/PM_BIN=C:\Program Files\Sophos\PureMessage\Bin\'
MSI (s) (80!D8) [00:35:47:052]: Closing MSIHANDLE (19719) of type 790531 for thread 21208
CustomAction SelfRegSharp returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)

So far we are unable to reinstall Puremessage so any help would be appriciated

We are using Puremessage 4.0.1 and the server is running Server 2008 R2

Cheers

Mike