kaya nagrerestart yan pag dinidelete mo kasi yung virus is running in your system under system process (svchost,winlogon etc),
try to turn off your system restore, tapos update your antivirus, boot in safe mode then full scan. install ka rin po ng anti spyware then full scan rin para malinis yung mga registry errors, a antivirus + spybot is very effective. goodluck.