When I try to install any gem I get this error

When I try to install any gem I get this error

My Ruby Version is 1.9.2 and Rails version is 3.2.13. My OS is Windows XP
I am using pik for managing multiple ruby versions.
When I tried to install curb it gives me the following error.
ERROR: While executing gem ... (Zlib::GzipFile::Error)
not in gzip format
I already tried to install gem by using the following command
gem install curb --platform=ruby -- --with-curl-lib="C:/curl/bin"
--with-curl-include="C:/curl/include"
Still I am not getting any success.