How can I quickly transfer large .mov files from Mac to PC?

I work as an editor for a small production company, at the moment I desperately need to transfer 6 x 8-20GB .mov files from a Mac to a PC. The files are too large to transfer via USB and whilst I have a drive large enough to hold them it is mac-formatted and cannot be read by the PC (even if the drive was formatted for both PC and Mac I presume it wouldn't accept files larger than 4GB?). I have also tried zipping the files down but A) they're still too big and B) the PC seems to have trouble unzipping files from the Mac. The final option I've considered is creating a network between the two machines and transferring the files this way but I worry about the length of time transfer will take and time is of the essence. Please let me know if you have any suggestions, I'm in a bit of a fix, but please keep things simple as I'm not hugely computer savvy!