is there a way to "reset" your cars computer system? my car locks lock/unlock when i start the car, the car sometimes hesitates before it starts, lights dim, radio cuts out when i release the gas pedal or open/close windows.

this is an '02 Jetta GLX 6 cylinder

my heated seats tend to only work when they want to as well. she's got about 62,000 miles on her but otherwise runs like a champ

any suggestions???