Join Date: Apr 2005
Bikes: 2004 Giant Boulder SE hardtail, 2008 Diamondback Response Sport hardtail, 2008 KHS XC 204 full sus mt bike, 2010 GT GTR Series 3 road bike.
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ISIS is just a cartridge. You should be able to yank it off the bike, get a new ISIS cartridge, install it, and use it with your existing crank.
You know it's 68mm english, which is all well and good, but we're not sure of spindle length here, so you'll want to find that out. Every BB I've seen from Octalink (Shimano's closed standard of ISIS) is written on it. 68x113, 78x118, etc. If that's the case, just order a new one accordingly.