Sometimes it’s been seen that the hyperlinks fail to work on email systems like Outlook Express, Outlook and any other Email Programs after installing windows updates or installing/uninstalling browsers. This is likely to be a problem with default browser settings and here are the steps you can reset the default browser settings.
Windows Vista/7
1. Open the Windows menu.
2. Type "default programs" (not including the quotation marks) under Start Search.
3. Click Default Programs under Programs.
4. Now click set your default programs.
5. Highlight Internet Explorer under Programs.
6. Click set this program as default.
7. Now click OK.
8. Close the default programs window.
Windows XP
1. Open Internet Explorer
2. Click Tools from the menu
3. Select Internet Options.
4. Click the Programs tab
5. Click the button labeled Make Default.
6. Click OK.
Test a hyperlink in Outlook to see if the web page opens in Internet Explorer. If that fails, continue with the following.
1. Click Start, click Run, type the following command in the Run dialog box, and then click OK:
regsvr32 urlmon.dll
2. Repeat step 1 for each of the following commands:
regsvr32 mshtml.dll
regsvr32 shdocvw.dll
regsvr32 browseui.dll
regsvr32 msjava.dll
As before, test to see if your Outlook hyperlink problem has been resolved. Refer Microsoft KB Article for more info.