Are you sure that you have read and understood the installation procedures for these files. Some files are straight forward installations while others require installing in different folders in FS2002. There are instructions also on any file changes that need to be made within those folders before they will show in FS. Most require the installation beforehand of certain UTILITIES(must have)before they will operate.
Go to the Simv download files and check out 'Utilities'.

As far as FS not working at all you may need to do a reinstallation. Good luck

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Hmmm. That must be a lot of scenery. 
I just checked the FS2002 Scenery section. It's currently on page 62. With an average of 10 files posted on each page that makes 620 different areas in the FS2002 section alone, not including the US Mesh Terrain which is posted separately. The FS2002 Scenery.cfg has a limit of around 333 areas. If you went on a mad download spree & added this all at the same time it could well cause a problem.

I don't know which method you used for installing scenery. The only method I would recommend is installing each area separately & activating it via the Scenery Library. Activate one area at a time & check it in the sim before activating the next. Then, if there's a conflict it can be easily deactivated. Please read my tute & follow the instructions. http://www.simviation.com/lair/fs2002sc.htm This method can be used for all types of scenery in FS2002.

Take my tip & ignore all advice or instructions to unzip files direct to FS2002. This is the most common cause of all problems with installing addons of any type.