I have been having problems with my computer freezing, cursor jumping all over so I can't even write a decent email. Sometimes it will not boot up and it shows a black screen only. I think it's severely infected. Sony Vaio VGN NR123E laptop Intel® Pentium® Dual Core processor T2310 (1.46GHz) 160GB hard drive Windows Vista home premium 1 Gig DDR2 I've had the computer almost 2 years. I'd appreciate any help!