Download SQUID Windows version. Place it under c:\squid\... Run C:\squid\sbin\squid.exe -i Start the squid service. If the service failed to start view the log file under C:\squid\sbin\
If you have Windows 7 Professional, Enterprise, or Ultimate you can install Windows XP Mode. Or if you want to downgrade you can do a clean install of Windows XP with an installation disk.
Not directly. You can format the hard drive and install Windows XP cleanly. You can upgrade directly to Windows XP Professional (which is more expensive).
If you are running Windows xp mode on Windows 7 professional, ultimate, or enterprise
partition
Yes.
How to install the IIS on Windows XP
There is no need to have a copy of Windows XP, as Windows XP Mode (which is a feature part of Windows 7 Professional and Ultimate) comes with a fully licensed version of Windows XP with Service Pack 3. A step-by-step instructions on how to download and install Windows XP Mode for Windows 7 can be found at related links section of this question.
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One can update Service Pack 2 on Windows XP Professional by visiting the Windows' update page. When on the Windows' website, press "update" and then install to complete the update.
You cannot install Windows ME over Windows XP from within XP. If you must (for whatever reason) install Windows ME, you will need to boot from the CD.
You need Windows XP installed before you can install Service Pack 3. However, if your installation media already contains Service Pack 3, then you do not need to worry about installing it since it will already be installed.
Use a Virtual Machine Program, such as Oracle VM VirtualBox, or Microsoft Virtual PC 2004/2007.