I repeat, disable all the other repositories if you had any troubles.
This repository provides every dependency of each package, though it frequently confuses if other repositories, especially ActiveState's one, are enabled. Stop using them, at least when you install something from this repository.
For your information, GUI version of ppm uses a cache database, which by default lies under the c:/Documents and Settings/(user name)/Local Settings/ActiveState/ directory (this name may vary due to your pc's locale info). Remove that if you still have problems.