Hey, I installed Mavericks over Mountain Lion (not a clean install) and it worked perfectly. However, my windows 7 bootcamp partition no longer shows up as a bootable option and under disk utility shows up as disk0s4. When I try to repair it this happens: Verify and Repair volume disk0s4Checking file system** /dev/disk0s4 Invalid BS_jmpBoot in boot block: 010101 Volume repair complete.Updating boot support partitions for the volume as required.Error: Disk Utility cant repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. When I start boot camp-assistent it says something like "Before using this assistent, you must update the Boot ROM firmware to your computer." Any ideas how to fix this? Thank you!