Solved....
Sharp Develop minimum requirements are very badly descripted....
Had to install .net framework 2. redistributable, .net farmework SDK and both Service Packs in order to be able to load correctly my previous projects....
Taximania, maybe this is whats miisng in your install?
.net framework 2.0 check?
.net framework 2.0 sp1 check?
.net framework 2.0 sp3 check?
.net framework 2.0 SDK check?