Redownload SNES9x 1.43 and stick it in a separate directory; your SNES9x.conf might have gotten corrupted.
Actually, this was back when Snes9X still saved things in the registry (in the Windows version); you'll have to read the readme to reset it.
But yeah, as someone else mentioned, 1.43 isn't supported any longer. if it matters it's almost EIGHT (!) years old, and the latest Snes9X (v1.53 or newer) should always be used. (Fun tip: some of the ports (such as Snes9X EX and Snes9X for PSP) are based off of Snes9X v1.43 for whatever reason, so those would be the only two logical exemptions, but the latest version should ALWAYS be used, regardless.)
PS: What exactly is 1.43 v7?
Snes9X only uses version numbers (1.29, 1.39, 1.43, 1.53, etc), there's usually no "v7" or any other nonsense tagged along with it.
Unofficial Test Monkey For:
* Snes9X GX (Wii)
* Snes9X EX (Android)
* Snes9X 64-bits (PC/Mac)ZSNES