dial-up diverted to premium phone number

[father ted]

My mums computer has picked something nasty......
when on-line the computer diconnects then immeadiately reconnects to a 0906 premium line connection.....luckily her phone company informed her and put a block on those numbers......in her internet connection folders,I found a connection for 'GBDial' and 'NV' neither of which were supposed to be there, i've erased those connections....is there anything else that should be done??.......i,ve done a full system virus scan that's come up clean........i think she picked this up in an e-mail attachment....cos when i checked the 'properties' of a suspect attachment (which was opened on day problems started) it has the word Bitch followed by some sort of protocol address? i.e xx.xxx.xx.xx type number form.

any tips/further advice?

Cheers in advance for any help.