Hi. I have an older machine running WinXP. Since it has only 40GB disk drive, I installed some non-critical programs on an external USB disk drive (drive F). As an example, I installed Adobe Acrobat on the external drive. Well, the external drive crashed, and no data can be recovered. Now when I try to reinstall the programs I lost (onto my C drive this time), they default to the external drive and won't install to C- I guess because my computer thinks the programs are still there. I can't delete the 'missing' programs using add/remove programs..it says the drive is unavailable. Can anyone tell me how to get around this problem? Can I solve this by doing a windows repair? Thanks.