I ran into a similar problem installing packages with FC2 on a dual boot with XP. The first time it gave me an error message I stopped the install and checked the integrity of the media. Everything looked fine so I started the install again. Same problem. I stopped and started again but this time I told it to retry. Sometimes 2 or 3 times but if finally installed the package. This happened with 4 or 5 of the packages but in the end FC2 was installed and running fine.
Then I tried to boot into XP and received a ton of partition error messages. Unfortunately I screwed things up even further before I got a very helpful message from DapperDan regarding FC2/XP dual boot errors. I have reloaded XP (my backup HDD went bellyup at the same time) and will try the fix on an install tonight.
