Mounting DOS/Windows partitions
Okay, so mounting DOS/FAT partitions from Windows is fairly straight-forward, as long as you feel comfortable (as a newbie) using the "root" login on Linux. Just do "mount /dev/whatever /mnt/windows" (assuming /mnt/windows exists). You just need to remove a virus or something, so from this state, you can read/write to this disk. (If not, mea culpa, use -o rw to enable mounting it with read-write). Other users might not have access to this partition, however, unless you further specify which user "owns" that mount. The previous post mentions this.
If you are using NTFS on your windows partition, however, depending on your module version, you may not have the option to mount read-write. (A few years ago, there was an excellent NTFS module that supported read-write; however it was beta, and even as of earlier this year, I had not seen this module in at least on major distribution.) So if this is the case, you need to get that particular module, install it, and mount the disk. There is, in fact, a bootable-CD with this module on it. Google for "rescue disk linux ntfs" or something like that.