I just recently upgraded my mb and cpu and now am intermittently (but most of the time) getting a "flickery mouse" in Windows 98.
System specs:
Epox 8KHA+, Athlon XP 1600+, 256m, IBM 46g + IBM 30g, LiteOn 24/10/40x, Toshiba 16x DVD, Voodoo5 5500, 3Com 3C905, Soundblaster Audigy
Gamer, AdvanSys...