windows sharepoint services install ?

Hi, i am running a windows 2003 server with PLESK 7.5.6. I have customers asking me to support windows sharepoint services.
i downloaded the package but I am afraid to install it on this server, i have in this server about 80 websites running. and I don't know how sharepoint will affect IIS. can somebody point me to how do I install it in order to offer sharepoint to my customers ? I am not very familiar with sharepoint features, if anybody that has done it can help I will appreciate it.

thanks

 

 

 

 

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