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OK I now its tricky without all the information. If I go into hyperV manager I get this error: [ATTACH] OK So its just a case of installing...
Err no the OP stated the changes they had to make to a vmx file to get it working. That was to enable hyperV it was nothing to do with memory....
@Parallels the issue is the support (or lack of it) for hyper-v running in the Parallels 8 VM. I realise this is perhaps a bad decision on M$ part...