[SOLVED] Projeqtor does not run any more

I receive this page when I try to start the project
This happened suddenly while C: was running out of Disk Space.
I created space in C: but the problem remains the same.

SQLSTATE[HY000] [2002] Aucune connexion n�a pu �tre �tablie car l�ordinateur cible l�a express�ment refus�e.


( ! ) Fatal error: Call to a member function query() on a non-object in C:\wamp\www\projeqtor\projeqtor\model\persistence\Sql.php on line 92
Call Stack
# Time Memory Function Location
1 0.0075 1276896 {main}( ) ..\main.php:0
2 0.0274 2876560 require_once( 'C:\wamp\www\projeqtor\projeqtor\tool\projeqtor.php' ) ..\main.php:37
3 0.0770 8893504 include( 'C:\wamp\www\projeqtor\projeqtor\view\login.php' ) ..\projeqtor.php:206
4 0.0780 9072584 Sql::getDbVersion( ) ..\login.php:38
5 0.0780 9073360 SqlElement::getSingleSqlElementFromCriteria( ) ..\Sql.php:340
6 0.0781 9074264 SqlElement->getSqlElementsFromCriteria( ) ..\SqlElement.php:2125
7 0.0781 9076352 SqlElement->getDataType( ) ..\SqlElement.php:1906
8 0.0781 9076512 SqlElement::getFormatList( ) ..\SqlElement.php:2447
9 0.0782 9077896 Sql::query( ) ..\SqlElement.php:2817

Please give us help,
Projeqtor is a wonderful tool for software companies and we found in it every thing we need

We did it. But this does not change anything.
But what can we do?
What do you think of un-installing and re-installing Wamp?
In this case will the database be lost? How to backup it before un-installing Wamp?
Thank you in advance for your help ... we started lovingProjeqtor

I took a copy of dbfile
I uninstalled all : Projeqtor and Wamp
I deleted all files
I reinstalled Wamp and projector
I overwritten dbfiles

Now it's OK.