Test port is failled!

Bonjour,
je ne suis pas un expert d'informatique,mais je me permets de vous poser quelques questions concernant mon pare-feu installé dernierement.En effet j'ai fait teste parefeu et je constate que le scan is failled d'apres unlien que j'ai trouvé (www,grc/ShielfUp),car j'ai des ports qui sont fermés mais visible..pourriez-vous s'il vous plait m'orienter afin de pouvoir remedier à cette situation?et est-ce qe mon pc cours des risques?
Voici rapport teste

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GRC Port Authority Report created on UTC: 2008-04-13 at 12:07:53

Results from scan of ports: 0, 21-23, 25, 79, 80, 110, 113,
119, 135, 139, 143, 389, 443, 445,
1002, 1024-1030, 1720, 5000

0 Ports Open
20 Ports Closed
6 Ports Stealth
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26 Ports Tested

NO PORTS were found to be OPEN.

Ports found to be STEALTH were: 21, 23, 80, 135, 139, 445

Other than what is listed above, all ports are CLOSED.

TruStealth: FAILED - NOT all tested ports were STEALTH,
- NO unsolicited packets were received,
- A PING REPLY (ICMP Echo) WAS RECEIVED.