Re-installing win 2003 server

I am not a windows admin and so this might be an entry level question. For test purposes I am trying to re-install windows 2003 server enterprise over a server that has win2003 server enterprise running. The setup CD fails and informs me that this is the same version as the OS installed and refuses to go forward. Trying to format the c drive but the volume is locked. Tried the dos format command with /x option which supposedly forces the volume to be formatted. no luck.
Any simpler techniques that anyone is aware of. Will appreciate the help.

AjazioAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You cannot format the same drive Windows is on while Windows runs. Boot off the CD and reformat from the CD.  If you meant "The setup CD fails and informs me that the version as the OS installed is newer than the CD" that's because the OS installed has Service Packs installed while the CD doesn't - you would have to slipstream the recent service pack into a new CD - I'd recommend using nLite.  Otherwise, you may not be able to install over itself if you are using an OEM CD which does not offer "upgrade" abilities.
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