MD11 FS9

Hi guys,Since my MD11 (FS9 and W.7 32bits) was behaving a bit erratically, I decided to perform a fresh reinstallation via PMDG with an extension ticket.BUT I did precisely WHAT I wasn't supposed to !!Means, some months ago, as per some forums recommendations, I moved FS9 and all components to secondary disc and ERASED manually what was left to original SSD main drive. Everything worked properly for months and recently noticed erratic behavior.PMDG not listed anymore in Configuration Panel programs.When I try to perform installation of recently downloaded file from PMDG, I have on installshield wizard "installation cannot continue. your registry does not show a valid FS9 installation location"Far from being an expert on computer handling, I'm rather lost with regards to above mentioned trouble and kindly request assistance from you guys.Many thanks in adnce for your cooperation.Rgds,Jacques TOURON