Why my pc spell checker doesn't work for me

Author: By Jerry Zar, Dean of the Graduate School of
Northwestern Illinois University.

I have a spelling checker
It came with my PC
It plane lee marks four my revue
Miss steaks eye can knot sea.
Eye ran this poem threw it,
Your sure reel glad two no.
Its very polished in it's weigh
My checker tolled me sew.
A checker is a bless sing,
It freeze yew lodes of thyme.
It helps me right awl styles two reed,
And aides me when aye rime.
Each frays come posed up on my screen
Eye trussed to bee a joule
The checker poured o'er every word
To cheque sum spelling rule.
Be fore a veiling checker
Hour spelling mite decline,
And if were lacks or have a laps,
We would be maid to wine.
Butt now bee cause my spelling
Is checked with such grate flare,
Their are know faults with in my cite,
of nun eye am a wear.