Solver 2010 is not working. 2007 on the same machine works fine. 2010 won't even attempt to run to a solution. it says it finds a solution without changing data, and then after closing solver, shows the error message

Microsoft Visual basic    Runtime error 453  can't find DLL entry point Solv in Solver32.dll

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Remove the Solver Add-in and repair the Excel installation and check if it resolves the issue. To remove the Solver Add-in do the following.

Open Excel > File > Options > Add-Ins > Select ‘Excel Add-Ins’ under ‘Manage’ and click ‘Go’ > now uncheck the check box for ‘Solver Add-in’ and click ‘Ok’.

Once done close Excel and repair the Office installation. Check the link below for information on Office repair.

http://office.microsoft.com/en-us/excel-help/repair-or-remove-your-office-programs-HA010357402.aspx#_Toc269981340

SPAM/Advertising Virus/Spyware/Malware danger Other Term of Use or Code of Conduct violation Child exploitation or abuse Harassment is any behavior intended to disturb or upset a person or group of people. Threats include any threat of suicide, violence, or harm to another. Any content of an adult theme or inappropriate to a community web site. Any image, link, or discussion of nudity. Any behavior that is insulting, rude, vulgar, desecrating, or showing disrespect. Any behavior that appears to violate End user license agreements, including providing product keys or links to pirated software. Unsolicited bulk mail or bulk advertising. Any link to or advocacy of virus, spyware, malware, or phishing sites. Any other inappropriate content or behavior as defined by the Terms of Use or Code of Conduct. Any image, link, or discussion related to child pornography, child nudity, or other child abuse or exploitation. SPAM/Advertising Virus/Spyware/Malware danger Other Term of Use or Code of Conduct violation Child exploitation or abuse Harassment is any behavior intended to disturb or upset a person or group of people. Threats include any threat of suicide, violence, or harm to another. Any content of an adult theme or inappropriate to a community web site. Any image, link, or discussion of nudity. Any behavior that is insulting, rude, vulgar, desecrating, or showing disrespect. Any behavior that appears to violate End user license agreements, including providing product keys or links to pirated software. Unsolicited bulk mail or bulk advertising. Any link to or advocacy of virus, spyware, malware, or phishing sites. Any other inappropriate content or behavior as defined by the Terms of Use or Code of Conduct. Any image, link, or discussion related to child pornography, child nudity, or other child abuse or exploitation.

I have the same problem, and even worse, I can't get any decent tech support for this product.  I just bought it on Amazon.com as a digital download, specifically to be able to use the latest version of Solver (I had been using Excel 2007), but I get the same problem reported by the other person.  My Excel 2010 is activated (it says so in Excel), but when I ask MS online support site to locate the license number, it can't find it.  So I entered it manually (and triple checked it for accuracy), and it says it doesn't match.  Go figure.  So now, I'm stuck w/this piece of junk that I paid over $100 for and can't even get the problem fixed.  &%$#@!

SPAM/Advertising Virus/Spyware/Malware danger Other Term of Use or Code of Conduct violation Child exploitation or abuse Harassment is any behavior intended to disturb or upset a person or group of people. Threats include any threat of suicide, violence, or harm to another. Any content of an adult theme or inappropriate to a community web site. Any image, link, or discussion of nudity. Any behavior that is insulting, rude, vulgar, desecrating, or showing disrespect. Any behavior that appears to violate End user license agreements, including providing product keys or links to pirated software. Unsolicited bulk mail or bulk advertising. Any link to or advocacy of virus, spyware, malware, or phishing sites. Any other inappropriate content or behavior as defined by the Terms of Use or Code of Conduct. Any image, link, or discussion related to child pornography, child nudity, or other child abuse or exploitation.