I have a two part question.  First some explanation:

I used to have Win98 on this computer with two hard drives.  The master (C:)
was a 1G with one MS-DOS partition.  The slave was a 10G partitioned into
five MS-DOS 2G logical drives (D:, E:, F:, G:, & H:).  I did this to
maintain compatibility with older OS's (some DOS 6.0 and WFWG computers were
still in use then).  I also had a CDRW drive as master on the motherboard's
second IDE controller which had the I: designation.

Later I replaced the 1G with a 300G (one NTFS partition) and moved up to XP
Home Edition OS.  After installing XP, I found the new drive had been given
the I: designation, the five logical drives were now C:, D:, E:, F:, & G:,
and the CDRW was H:.  I had no time to deal with it and it was working, so I
let it be and installed all my apps.

Now, I am desiring to change I: to the proper C: and repartition the 10G
into one NTFS partion.  Everything that was on the 10G is now on the 300G,
plus it's all backed up off the computer, so there's no danger of losing
that data.  A potential problem is that I have none of the installation
disks for any of my apps (due to a personal life upheavel).

Question #1:  Can I change the drive letter from I: to C:?  If so, how?

Question #2:  Will changing the drive letter from I: to C: cause problems
with XP finding the apps (because they are all registered as being on I:)?
If so, what would be the easiest way to avoid or correct that?

Thank you very much for your assistance.
Shevie