Permission denied error when saving the Global Configuration

[johnsm]

I am running joomla 1.5.25 on IIS 6.0 Everything works fine except for one issue. When trying to access the Global Configuration under:
Administration >> Site >> Global Configuration

I was getting a FastCgi error until I determined what the culprit was. It was the file application.php under:

administrator >> components >> com_config >> controllers

The offending line was: $stores = JCache::getStores();

If I comment out this line, the Global configuration works but I can not save my changes. I get a permission denied error when trying to save the changes. I read that I need to get caching working correctly for the permissions issue to be resolved, but I do not know how to fix the FastCGI error from the JCache line above.

Does anyone have any idea how to resolve this?

Thanks.

[mici]

I'm new to joomla and I'm configuring my first site, but ended having a problem with the Global Configuration, when I try to save it, i receive a 500 error.

I'm using php internal server to run it, "php -S localhost:8081"... everything else is working fine..