The drive is formated for mac so it cannot be read by the windows computer. If you are using it for time machine, then it is inaccessible to the windows side of things unless you create two partitions and format one as a FAT or NTFS.
As a fact I've already formatted a partion as NTFS, Im not a TOTAL idiot.
Word of advice: In the future, actually tell us what you've done when you ask a question. Then, perhaps, we'll be able to not recommend something you've already done.
As a fact I've already formatted a partion as NTFS, Im not a TOTAL idiot.