I use Delphi 7.0 on Windows 7, 64 bit, no problem. I previously installed it on Windows 7, 32 bit and used it without problems.
Windows will bother you about incompatibilities when starting the installer. You should probably make sure that any user using Delphi 7 will have full write access to the folders in the Program Files that Delphi 7 needs to record.
I have my copy installed in Program Files, and I use it only from the admin priveleges account, so I can write / modify files inside the installed Delphi folders without any problems. Some people find it better to install on C:\Delphi7
.
No one can know for sure about your components, but you should just try them.
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