A kaafir married a Muslim woman then he became Muslim
Question

                A hindu married a muslim widow. After some years, attracted by the islamic manners of his wife, has converted himself to islam.  Do they have to their remake the Nikah, or the one they made earlier when he was a hindu and she a muslim is sufficient? 

Muslims in india are reciting Salawat un Naria 4444 times to get rewards and to avoid calamities.  Eventhough we explained that it is enough to do Salawaat to Muhammed (PBUH) as he prescribed and not to recite Salawaat un Naria, they continue reciting, saying there is no harm in it.  Is it permissible to recite and also please explain in detail if there is any shirk associated in the meaning of Salawaat un naria.
Praise be to Allah.
    The marriage of a Muslim woman to a kaafir, no matter what 
    his religion, is invalid according to sharee’ah and their intimacy is 
    tantamount to fornication. They must be separated, because Allaah says 
    (interpretation of the meaning): 

    “And do not marry Al-Mushrikaat (idolatresses) till they 
    believe (worship Allaah Alone). And indeed a slave woman who believes is 
    better than a (free) Mushrikah (idolatress), even though she pleases you. 
    And give not (your daughters) in marriage to Al-Mushrikoon till they believe 
    (in Allaah Alone) and verily, a believing slave is better than a (free) 
    Mushrik (idolater), even though he pleases you. Those (Al-Mushrikoon) invite 
    you to the Fire, but Allaah invites (you) to Paradise and forgiveness by His 
    Leave”

    [al-Baqarah 2:221]

    And Allaah says, stating that the Muslim women are not 
    permissible in marriage for kaafir men (interpretation of the meaning): 

    “They are not lawful (wives) for the disbelievers nor are 
    the disbelievers lawful (husbands) for them”

    [al-Mumtahanah 60:10]

    Al-Qurtubi (may Allaah have mercy on him) said in his book 
    al-Jaami’ li Ahkaam al-Qur’aan (3/72): The ummah is unanimously agreed 
    that a kaafir man cannot marry a Muslim woman at all because that undermines 
    the position of Islam. 

    But if the man becomes a Muslim – as mentioned in the 
    question – then he must re-marry the woman with a new marriage contract, 
    because the first marriage contract was invalid and does not count for 
    anything in sharee’ah. 

    Shaykh ‘Atiyah Muhammad Saalim said in his completion of the 
    book Adwa’ al-Bayaan, 8/164-165: 

    Why is it permissible for a Muslim man to marry a kaafir 
    woman from among the People of the Book (i.e., Jews and Christians), but it 
    is not permissible for a Muslim woman to marry a kaafir man from among the 
    People of the Book?  

    This question may be answered from two angles: 

    1 – That Islam should prevail and not be prevailed over. The 
    role of maintainer and protector in marriage belongs exclusively to the 
    husband, so the man may influence his wife and she may not be able to 
    practice her religion as she should, and she may leave her religion 
    altogether. Similarly the children will follow the religion of their 
    father. 

    2 – Islam is comprehensive and other religions are limited, 
    on which there is based a social matter that affects family life and the 
    relationship between the spouses. This means is that if a Muslim man marries 
    a Jewish or Christian woman, he believes in her Book and her Prophet, so he 
    will deal with her on a basis of respect for her religion because he 
    believes in it in general terms, and that will give them some common ground 
    which may lead to her becoming Muslim as her own Book tells her. But if a 
    Jewish or Christian man marries a Muslim woman, he does not believe in her 
    religion so he will not have any respect towards her religion or her 
    principles. There is no room for common ground with him with regard to 
    something that he does not believe in at all. So there is no room for 
    harmony or mutual understanding; there is no goodness in such a marriage, so 
    it is forbidden in the first place. 

    So they must make a new marriage contract. And Allaah knows 
    best. 

    With regard to the question about al-Salaah al-Naariyyah, 
    please see question no. 
    7505.