when the driver's side window starts rolling down, it makes a very loud squeaking noise!! quite embarassing, is there a way to make the noise go away? the windows are tinted. also, all 4 windows seem to "struggle" when going down & up, they are not very smooth but quite jerky.. thanks for help

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe