How to uninstall?

I need help with the uninstall process.

I used the memcache.db.inc. I disabled the memcache_api module, removed the lines from the settings.php, and stopped the memcached daemon. The things till this point looks good. The problems coming at the next step.

If I remove the memcache module I gave the following php errors:

[Fri Dec 04 08:21:29 2009] [error] [client 84.0.60.235] FastCGI: server "/path/to/my_root/fastphp" stderr: PHP Warning
:  require_once() [<a href='function.require-once'>function.require-once</a>]: Unable to access ./sites/all/modules/memcache/m
emcache.db.inc in /path/to/my_root/includes/bootstrap.inc on line 1009

And If I remove the memcache php extension I gave the following php error:

[Fri Dec 04 08:15:23 2009] [error] [client 84.0.60.235] FastCGI: server "/path/to/my_root/fastphp" stderr: PHP Fatal e
rror:  Class 'Memcache' not found in /path/to/my_root/sites/all/modules/memcache/dmemcache.inc on line 186, referer: h
ttp://neotthonulj.wmaps.hu/fezen_klub_karacsonyi_rock_party_2009_11_21

I tried to clear the caches, but it didn't solve the problem. What am I doing wrong? I can't understand what is the problem with the steps.