using winXP is it possible to use the comand prompt to change default internet browsers?

I have a batch that deletes instances of aolexplorer but if aolexplorer is the default browers it causes minor problems.What is the purpose of this?I work in a computer lab and people are always downloading things like aim and run a full install which includes the aol explorer. AOL explorer SEEMS to cause more problems on our computers than any other browser including IE and every time it crashes we get complaints that their internet won't work when simply using IE or Firefox will work fine for them. So I made a batch that GETS rid of aol explorer but if it's already taken over as default browser it makes internet links for classes fail to open since they are looking for aol explorer to run on. So I need to get the batch to put IE as default to prevent this.the admin is a power user........you have the control of the pc.Yes but I also have 72 computers in this ONE lab that I am RUNNING my batch file in.

It's not a particularly easy thing to know which computer has aol explorer as default.

And soon since the file is really helping control lab usage according to College Policies it will probably be put on all 3000 computers.

Neither I nor anyone else will individually go around and check every computer.

But I'm not ENTIRELY sure or not if I need to do this but if it is possible I would love to know how.