Ok, here is what you should do if its easy access your aiming for.. Just create a shortcut to the folder with the refills in it on the left hand side of the Instrument Load screen ... Leave the refills where they are on your computer... That sounds like what is messin u up... Reason is looking for the refill or instrument in a location where it does not exist... Thats option 1

Option 2..

Physically move your refills (in Windows Explorer) from your My documents folder to the folder you move them to in reason. If you move them to the right place, the previous tracks you've created should then open without a problem and there you go...

try those and lemme know what happens