Probably the easiest thing for you to do is:
Go to this site
http://www.visualtour.com/downloads/default.asp
Scroll down to the 2nd article, download the Xp_fix.exe (Dated 07/29/2004 - 140kb) and install it.
Quote:
This installaton program will reinstall the missing or corrupt Windows XP system files command.com, autoexec.nt and config.nt. The absence or corruption of one or more of these files causes a "16 Bit Subsystem" error.
We recommend that you download this file and save it to your desktop or to another location where you can find it. Double click on the file to run it once it's downloaded. If problem reoccurs in the future, simply re-run this program.
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Quote has been taken from visualtour.com
Hope this makes it easier for you.