cant record stereo but faint mono!!!

After i reloaded &activated my operating system(windows 7 ultimate, service pack1), i cant record stereo and even the recorded mono is not too clear. i have reinstalled Audacity and problem is still persistent. what can i do to regain my best output?

You can tell us what you’re recording and how.

http://www.kozco.com/tech/audacity/Documents/PostingQuestions2.pdf

Koz