Having issues installing DotNet updates via Windows Update? Try:
Run cleanup tool:
http://astebner.sts.winisp.net/Tools/dotnetfx_cleanup_tool.zip
and select remove (cleanup) .NET Framework 1.1 from the dropdown list.
Download the .Net framework 1.1 redistributable package from here
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=262d25e3-f589-4842-8157-034d1e7cf3a3
and install it.
Download the .Net Framework 1.1 Service Pack 1
https://www.microsoft.com/downloads/details.aspx?familyid=A8F5654F-088E-40B2-BBDB-A83353618B38&displaylang=en
and install it.
CIAOPS 