coordinate system - Convert Lambert Conformal Conic to WGS84

I am trying to convert my "Lambert Conformal Conic map with 2 standard parallels" to the basic/standard WGS84 projection that Google Maps use.

I have 30 of these maps which I need to convert. They are all in .tiff format with a corresponding .tfw file each.

What my final goal is:

1. Convert Maps to WGS84


2. Merge all 30 maps


3. Change them to tiles

For now I am only struggling with the conversion of projection.

Does anybody now of any ways/programs/techniques or anything (preferably free) to accomplish this?

I have heard/read about GDAL etc. but I do run Win Vista, not MAC.