Windows XP freezes after downloading from Softronic

Hi,
I recently reloaded mozilla thunderbird via a 'softronic' download.
Within a couple of days my computer began to freeze up.
I would switch off and restart and it would work for a few hours before the problem happens again.
I ran various virus and malware programmes to no effect.and used restore points several times but the problem persists.
I have heard that occasionally 'softronic downloads' can also give you a little more than you bargained for.
Does anybody know if this is true and if it is (or isn't) how do I get rid of it ?

Thanks.
 
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