Try to uninstall and reinstall SW Explorer
EPDM/SolidWorks Explorer Requires e-Drawings 32 bit, so if you have it installed on a 64 bit machine you need to have that version installed. You can find the install files in your EPDM Install folder of just re-download it from the portal. We have to have both 32 -bit and 64 - bit on the machines due to this requirement.
Sorry, I've refered to SW e-drawing