CNET has a round up of some pretty awful tech ads from years gone by. There's (what is apparently an internally-focused) one for Microsoft, a couple of Apple ones and a smattering of others.
Here's a couple:
Nice. Subtle.
And an early staring role by Kevin Costner for Apple:
As much as this is laughable, there is something charming about the optimism it shows. Those were the days.
See the others here.
One thing to note – I had nothing to do with any of these.