VISTA ???

[SPIT]

I have been using Win Vista for approx 12 months now but in the past (3 months approx) I have been getting 3 updates every 3 days and this is shutting down my computer and the restarting it with NO WARNING so I therefore have to re-start what I was doing. As you can imagine this is VERY ANNOYING so beside loosing my temper with this every time is there ANYTHING I could do to prevent this. Surely MICROSOFT WIN do NOT require every 3 days ???