I think your ISP is a bit confused about what a PHP Accelerator does. A compiled and accelerated PHP script does exactly the same as a non-compiled PHP script, but only much faster. SQL statements has nothing to do with PHP Acceleration.
With eZ publish it roughly double the performance.
We are running APC here on ez.no, other accelerators works great as well.
on your xp machine. Take the
ZIP archive or
EXE (7-zip) Selfextracting 7-ZIP archive then there are no entries in regestry und you can just delete it. You can use it from USB-Stick, too.