it sounds as You have not changed the directory for "Report".txt file form templates in the Solid Edge installation directory to a customized folder.
So if You used the c:\program\Solid Edge\template\reports folder and uninstalled SE from there, I think that the only way to get Your saved callouts is to open old drafts, where they were used and save them again.
But before doing so, change the reports directory to a plate at Your server (as it should be for all of customized files) to keep them for future use.
Custom callouts are usually in Program Files\Solid Edge STX\template\reports\draftcallout.txt but could be anywhere you are pointing to templates. So, if you can retrieve your old draftcallout.txt file you should be able to use it by putting it in your current templat\reports folder.