Sent my laptop off all for repairs, it requisite a new motherboard and a new charger diddley, has returned beside viruses!?

You need to find some decent opposed virus package installed on you computer and then run a virus removal scan to get rid of it. Provided it's a more spiteful form of infection then you May need to involve school support which is commonly free from a reputable anti virus company. Use software such as McAfee or Norton.

Former clean effect the software to run regular virus checks once a week on all applications especially e-mails and their attachments which should be done constantly.

Also, provided your sure and can prove that the infection has come from the repair shop past you need to air a claiming some form of compensation from then as well as reverting the PC and exacting they clean up the machine for you - free of charge, after all it was their fault!! I usually find that the threat of bad publicity within the local press and or the Internet does the trick!!

Regards, Kevin.