These are different than the one Richard suggested, but the first is similar (an online converter) whereas the second is an installed program - but they are admittedly based on Richard's original idea. Richard himself has often said it doesn't matter who mentions an option or idea first - what matters is trying to solve the problem (in this case, now as a team) - and I completely agree with this concept. Other programs, especially the second which is not online and so may not have the same problems with logos as the online versions (which I admit I didn't realize occurred or that it would be an issue), offer additional alternatives - and that may help solve the problem. According to the publisher of the second one at least:
"The Free HTML to PDF Converter is a .NET 2.0 managed application which was built with the Winnovative HTML to PDF Converter Library for .NET. The application does not require any printer driver installation or other third party tools and is delivered as a simple Windows .exe file. You can convert to PDF any Web page from a specified or HTML/MHT file from the disk completely for free.
The resulted PDF has no stamps on it or other limitations. The application allows you to add headers and footers, page numbers, set page size, page orientation and PDF compression level, embed true type fonts. Using the same application you can also convert HTML to BMP, JPEG, PNG or any other format."
But I haven't used it, so I can't say for certain. Given that it says it has no stamps on it, I take that to mean it has no logos (but that's just my interpretation of that statement - it may be referring to something entirely different).
Incidentally, it would not hurt to run the Upgrade Advisor that Richard suggested even if this program resolves the problem (and certainly if it doesn't). It would be good to understand, if possible, why you're having trouble installing Adobe Acrobat Pro so we can either address the problem if necessary or identify the cause and possibly fix it as it may occur again with other programs even if it turns out you don't need these at this time. Are you certain you downloaded the correct versions for your current operating system?
Incidentally, here are the system requirements for Adobe Acrobat 10 - more than just RAM (which 3GB meets).
http://www.adobe.com/products/acrobatpro/tech-specs.html Is Vista fully updated including SP2? Are you OK with the other specs?