i don't know about "FIPS", but u can definitly use "Patition magic" to re-partition your HDD without loosing data.
then in the empty space make two partitions for linux.....i.e one for swap and one as main partition...u can even make other partitions of "linux" types also.
3. main partition
this is good, as if someday u somehow lose yr linux, yr backup/date in home will remain there and so u can easily install new linux on the main partition.
read this tutorial
it may help you.
in case of any doubt post it.