Our four year old Dell computer got some nasty virus and had it worked on by two different people who thought they got rid of it (them) and slowly everything deteriorated and finally shut down. Do we need to buy a new one or can this machine be turned back on somehow and a program bought or something to fix the problem? We did have virus protection but evidently wasn't working properly. We have money issues so that is why we are hoping to salvage this one for now. Would appreciate any and all advise!