Before start the P2V using VMware Converter, do you disabled all non-Microsoft and non-VMware Converter services and rebooted the server using msconfig ?
Another workaround is try P2V only C: drive first and after finish the C: conversion, start another one only with E:.
Note: the conversion with drive E: may fail saying that reconfiguration is not possible, but ignore this message, remove the VM created on E: conversion, but do not delete from datastore, after go to VM created on C: conversion and attach the drive E: created.