help with media files

hey all i have a major problem i have over 80 downloaded movie files in avi and mpeg format they all played fine till yesterday when i downloaded nero express now none of my files will play at all unless opened in nero’s media player i uninstalled nero hoping this would correct the problem but i have had no luck none of the files will play in windows media player or power dvd which they did any help would be grateful thankyou

by the way i have used gspot i have the correct audio and video codecs

does anyone answer this forum if not can someone suggest a forum that may help

Nero changes some of your registery setting you need to run a register clean/fixer to clean up the mess