Installing W7 Pro over Ultimate

I unwittingly purchased a dodgy copy of Windows Ultimate a few months back - Microsoft just informed me a week ago. So I have now purchased a good copy of W7 Pro thinking I could just replace one with the other but on researching this, it doesn't appear to be the case. I have backed up all my files and programs onto an external hard drive and I have partitioned my C drive. If I install W7 Pro on the partition, will it work over and above the Ultimate? If not, can I just do a clean install with the W7 Pro from scratch and if so, will that work? I really don't want to mess my PC up as I use it daily for work. Thanks


Microsoft MVP
Staff member
Premium Supporter
Microsoft MVP
Run a clean install after formatting the drive. A clean install is always to be preferred for all sorts of reasons and especially when replacing "dodgy" software.

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