Something's not right having so many problems with Vista, we have the identical Acer model and I let Vista auto-install every single driver and have been running rock solid since last fall.
I really advise minimizing experimenting with drivers without specific reasons. The 303 has none except external secondary display Intel 855 chip video known issue Vista will update when/if ever available automatically as designed. The 303 and 310 have entirely different graphics architecture. One can add in foreign drivers but Vista will default back to original driver, as Device Manager will show.
More details on exactly what the crashes involve might help. Vista has very detailed crash reporting also.
If you have Vista Home Basic there's no pen support. Minimum is Home Premium, Business and higher.
100% Old School tablet setup:
Sahara i440D - 4GB/500GB/7200 - Vista screams!
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - portrait - primary computer.
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - primary work computer.
HP TC1100 1.0 - 2GB/60GB/7200 - XP - laptop - partner's primary computer.
Acer 303xmi 1.6 - 2GB/100GB/7200 - Vista - laptop - work computer.
Motion M1300 1.0 - 2GB/60GB/7200 - Vista - semi-retired (needs repair).
Motion M1300 - for parts.
Motion M1400VA - awaiting resurrection.