Car cranks slowly but won't start

What is your question?

When i bought the car it was alright, but after a week it sometimes wouldn't start and when it doesn't start I would mess with the garbage aftermarket security in it and it would start. Once I had to put in neutral to start. Last week I went to lunch and it wouldn't start. Did the same thing and nothing. Called mechanic and he told me I had to touch the starter wire from security system to fusebox hot. Worked for 2 days now it doesn't. Fuel pump fuse blew and no longer heard it turn on so I replaced it still wouldn't work Ignition 40amp maxifuse blew changed it still won't work. Oxygen sensor fuse blew I assume a long time ago because I had ce light on for it since I bought the car. It was slightly melted My car has some sort of fuse box problem before I just touch starter to start car but now it doesn't work at all it will crank super slow and multiple fuses have popped but I replaced them all

How long has your 2004 Buick Century had this problem?

1 week