What was the reason for having to reinstall?
MindoverMaster did bring up a valid point about reformatting - this is important in the case of viruses, as there are several that will not be destroyed unless your entire drive is reformatted. I even go as far as to format with Unix, then go back to NTFS when reinstalling Windows. The way Windows file system works, is that all references to something "deleted" off of your hard drive are remove, and then it is marked to be overwritten when something new needs to be saved. However, this means all of the old contents you deleted are still there and can be recovered with a utility.
If it was just a reinstall for fun, then you might want to try partitioning the hard disk next time with "fdisk" in a dos command line. Then you can access all of the previous saved items from the last install as if they were on a separate hard drive, once you're done going through those items you can reformat just the old partitioned part, and then remove the partition again.