91 Honda Accord Belt Sqeels And Loses Power on Acceleration?

My 1991 Honda Accord 214xxx miles Has Always Had a Belt Sqeel Only On Startup and lasts Only 4 secs
But Recently since winter is coming its colder and the belt sqeels longer on startup as well as this new problem of when i accelerate it sqeels louder and i feel the car like not speeding up or no acceleration with it sqeeling like the belt is not grabbing and its not accelerating the car once the sqeeling stops i gain power again and can accelerate Normally
Now The Belt I Think The Serpentine Belt Its Called its Connected to the alternator and the 2nd belt is connected to the power steering which belt do i need to work on the belts are tight as they should be so what is causing the sqeeling and slipping?

The alternator (and A/C, if equipped) belt is the troublemaker. The alternator load is heaviest after starting, which is why the squeal appears then. But it is a good idea to replace both belts - they are cheap and are probably about the same age and condition.