Vendors (like Oracle and TOAD) should know Microsoft is capable of doing strange things with important directory names (using spaces and, in this case, “strange” characters like parentheses)…and of course, Microsoft should simply stop perpetuating the use of these characters in important directories. Everything is working great, without having to reinstall anything. to C:\Program Files\., and restarted the TOAD.exe. I simply copied over my entire Quest Software directory from C:\Program Files (x86)\.
You are likely running a 64-bit Windows OS and have installed TOAD into C:\Program Files (x86)\. This really threw me off for a minute, so I thought I would share the resolution. I recently downloaded the new 10.x version of TOAD and could not connect to my databases.