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Can you post the complete error message. As this error is very usual and it comes out most of the times due to some memory issues as well.
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Can you post the complete error message. As this error is very usual and it comes out most of the times due to some memory issues as well.

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The full message is,<br />
Class not registered, Error: REGDB_E_CLASSNOTREG (0x80040154)<br />
I attached a JPG of the error...<br />
<a href="https://filedb.experts-exchange.com/incoming/2010/10_w40/354276/SP-2-Error.jpg" target="_blank" class="file-inline" title="Error message... (18 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>SP-2-Error.jpg</a>
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The full message is,
Class not registered, Error: REGDB_E_CLASSNOTREG (0x80040154)
I attached a JPG of the error...
SP-2-Error.jpg [https://filedb.experts-exchange.com/incoming/2010/10_w40/354276/SP-2-Error.jpg]

SP-2-Error.jpg

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Thank you for your assistance.
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I am trying to install SP 2 on Windows Vista and I keep getting &quot;error regdb_e_classnotreg&quot; please any information you can give me to this resolution is appreciated.
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I am trying to install SP 2 on Windows Vista and I keep getting "error regdb_e_classnotreg" please any information you can give me to this resolution is appreciated.

Windows Vista SP 1

Windows Vista is an operating system created by Microsoft as the successor to Windows XP. It was intended for PCs, workstations and laptops, and shares the same code base as its successor, Windows 7. New features included an updated graphical user interface (GUI) and visual style dubbed Aero, a new search component called Windows Search, redesigned networking, audio, print and display subsystems, and new multimedia tools. Vista aimed to increase the level of communication between machines on a home network, using peer-to-peer technology to simplify sharing files and media between computers and devices. Windows Vista included version 3.0 of the .NET Framework, allowing software developers to write applications without traditional Windows APIs.