Are you using 3.5 ? Cause i noticed the same thing when i was using 3.5 the thing would just throw a fit or something, shut down, forget the web sites that i was on and then have a tantrum over been re-started.... So i back dated to 3.0.15 and low and behold its been pretty stable with only one crash in about two/three months of using it
My only bitch with Windows 7 is linking two confuses together - passwords, computer names, bit of this, bit of that yadda yadda, wave your arms around like an idiot and pray to the computer god they link.
and then after a bit one throws a hissy fit, good bye link in one direction, so you reset the connection and cause the other confuser doesn't like the "new" reset connection its all back to waving your bloody hands around like an idiot.