enabling curl on IIS

[bronto]

I have an existing php 4.3.11 installation on a Windows 2003 server using IIS. I am attempting to get Linkpoint API working, and it needs curl and openssl. This is the first time these services have been needed on this server; it has some php and asp scripts using verisign working already.

I know this should be as simple as uncommenting the curl and openssl extension in php.ini, but when I do this IIS hangs. Completely non-responsive. I have verified that all the files that came with the php distro are there, that the openssl.cnf is there and the environment variable is point to it, and that the path includes C:\php.

I'm stuck. Any ideas are welcome.

[bronto]

I realize I should have provided at least the list of enabled extensions. Here's the configuration that works; enabling either php_curl.dll or php_openssl.dll causes IIS to hang.

;Windows Extensions
;Note that MySQL and ODBC support is now built in, so no dll is needed for it.
;
extension=php_bz2.dll
extension=php_cpdf.dll
;extension=php_crack.dll
;extension=php_curl.dll
;extension=php_db.dll
;extension=php_dba.dll
;extension=php_dbase.dll
;extension=php_dbx.dll
;extension=php_domxml.dll
;extension=php_exif.dll
;extension=php_fdf.dll
;extension=php_filepro.dll
;extension=php_gd2.dll
;extension=php_gettext.dll
;extension=php_hyperwave.dll
;extension=php_iconv.dll
;extension=php_ifx.dll
;extension=php_iisfunc.dll
extension=php_imap.dll
;extension=php_interbase.dll
;extension=php_java.dll
;extension=php_ldap.dll
extension=php_mbstring.dll
;extension=php_mcrypt.dll
;extension=php_mhash.dll
;extension=php_mime_magic.dll
;extension=php_ming.dll
;extension=php_mssql.dll
;extension=php_msql.dll
;extension=php_oci8.dll
;extension=php_openssl.dll
;extension=php_oracle.dll
extension=php_pdf.dll
;extension=php_pgsql.dll
;extension=php_printer.dll
;extension=php_shmop.dll
;extension=php_snmp.dll
;extension=php_sockets.dll
;extension=php_sybase_ct.dll
;extension=php_w32api.dll
;extension=php_xmlrpc.dll
;extension=php_xslt.dll
;extension=php_yaz.dll
;extension=php_zip.dll