Computer guru help needed!!?

Just bought a new Gateway desktop and for some reason …anytime we click on an application, no matter what it is, the computer just freezes up, requiring a hard reboot (turning off the computer at the powerstrip). It won’t let us do anything. We use the computer primarily for surfing the internet. Should I run the antivirus software and see if that cures the problem before taking the tower back to Best Buy to have them run a diagnostic or do you think that’s a bad idea? Thanks.

memory and registry cleaners?

i did a scan on my pc it said i have 840 errors on my pc i need a registry cleaner the ones ive tried only take out one or two where do i buy one ?what store dont want to order on line also how do i get more memory on my pc how do you put it on ?where do you get best buy doent understand what im talking about,my pc is vista home basic ,how much does it hold help ,help, thanks

So I bought my computer from best buy last may and now it has this virus that keeps popping up saying I have a virus so I buy the software.. I already have anit virus protection but apparnetly this isnt good enough.. anyways Best Buy is telling me they want to charge me 199 for a diagnostics fee plus an new anti virus protection.. they also said that I could get the anti virus and it may "heal’ the computer… please help me I know nothing thank you~

I need some guidance on handling a problem I recently experienced through Best Buy. My mother took her computer in because it was acting extremely sluggish and freezing up. Initially they told her it was .99 for a diagnostic exam. Later in the week she recieved a phone call telling her to fix the problem they needed to run extensive diagnostics and repair which would cost an additional 9.99 because they found viruses. They took our the viruses and installed some childsafe software and the total came to 0. They then called and said they discovered it was actually a bad harddrive and it needed to be replaced (an extra 0). Since replacing the harddrive will completely eliminate the work they did previously, I am wondering what our rights, as customers are. She specifically asked if she it was cheaper to buy a new computer and was told her computer is good and should last about 3 more years. Should they have been able to diagnose the bad harddrive from the inital tests

I have a Dell Inspiron 1520 laptop. My antivirus software was Symantec. Last night, i uninstall Symantec and installed Trend Micro Internet Security. The installation completed successfully. Than I tried to do the updates for Trend Micro and after about 15 minutes of updating, an error message came up saying it’s not finish updating and can’t update or something like that. Than suddenly, the screen went gray. I tried rebooting and it kept pushing me into safe mode and I had to run a repair but nothing is working. Every time I start the laptop it goes in that safe mode and wont even let me get on. I took it to Best Buy for a diagnostic (waiting for response) but wanted to know if this has this happened to anyone??????? Do you think it’s hardware or software??