Unity pro is qualified to work on below system requirements.  Windows 7 platform is no more validated for unity pro 4.1.

System with Microsoft Windows Vista Business Edition 32

System: Pentium Processor 2.4 GHz or higher, recommended 3.0 GHz
RAM memory: 1 GB minimum; recommended: 2 GB
Hard disk: minimum available free space 8 GB, recommended 20 GB
Microsoft Internet Explorer 5.5 or higher

System with Microsoft Windows XP Professional Edition

System: Pentium Processor 1.2 GHz or higher, recommended 3.0 GHz
RAM memory: 512 MB minimum; recommended: 1 GB
Hard disk: minimum available free space 8 GB, recommended 20 GB
Microsoft Internet Explorer 5.5 or higher

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