Drive keeps changing name (G, K, L etc.) from PC to PC

It can be done with some slightly fiddly cheating with the install file.

In install\install.php, look around line 19 for a line like this (it's been like this since 1.5):

$partwampp = substr(realpath(__FILE__), 0, strrpos(dirname(realpath(__FILE__)), '\\'));

What this does is it gets the installation directory of XAMPP, e.g. "X:\xampp". Now, you can cheat here by chucking away the first two characters, and making it into something like "\xampp"! It's the technique I used when I was wanting my copy fixed.
Change the line to the one provided below (probably with an appropriate comment about what you did):

$partwampp = substr(realpath(__FILE__), 2, strrpos(dirname(realpath(__FILE__)), '\\'));

Then you can run setup_xampp.bat and it should update your paths. If you really want to, here, you could move it from X:\xampp to X:\PortableApps\XAMPPPortable\App\XAMPP...

(Disclaimer: this will stop FileZilla Server from working, as it requires absolute paths to run... but then, it also requires running as a service, so now it's just doubly out!)

Don't do it this way: even if it does work properly (which I doubt) it won't work efficiently. My solution is perfect.

BTW, use the <pre> tag to format code things.

This way you can get your code to display
properly.

:-)

One solution which will work in the vast majority of cases (probably more than 99.999%) is to use the program SUBST to associate

A single line which you can put in a batch file (while I hate the way people use batch files for everything, it's simpler here to do it as a batch file) to do this is subst B: %cd:~0,3% (where the working directory is anywhere on the USB drive).

Of course though the idea here is to make this unnecessary wherever possible, and it's possible in the vast majority of cases. My fix up higher deals with making XAMPP work once more.