This seems to have worked in the past:-
1) Launch IE, go to Tools then Internet Options.
2) On the General tab (which it launches to) delete cookies and temporary internet files, including all offline content.
3) Go to Advanced tab, lower right, click on restore defaults and click Apply.
4) Go to Programs tab, middle left, click on reset web setting, (recommend you deselect reset homepage).
5) Go to Privacy tab (if present), if Default Levels button is active click it.
6) Go to Security tab and for each zone set levels to Default Levels if said button is active, click OK.
If that doesn't work, then run all of the following, clicking OK after each:-
Start > Run > regsvr32 urlmon.dll
Start > Run > regsvr32 Shdocvw.dll
Start > Run > regsvr32 Msjava.dll
Start > Run > regsvr32 Actxprxy.dll
Start > Run > regsvr32 Oleaut32.dll
Start > Run > regsvr32 Mshtml.dll
Start > Run > regsvr32 Browseui.dll
Start > Run > regsvr32 Shell32.dll