Roger Stewart said:Windows 7, my own internet, 4 GB of RAM, and a 500 + 60GB drive
Your computer is actually more powerful than mine, and I don't run into these issues even though I don't have direct internet—I'm actually piggybacking off my neighbor's connection... First off, you should check if someone else has hopped onto your network. There are plenty of programs out there to help you verify that...
Then there's the processor... Mine is dual-core... so what are you running?
If you've got a dual-core processor, you really shouldn't be dealing with these kinds of problems...
I dealt with similar issues on my old laptop and desktop because they had low RAM, a weak processor, and a small hard drive... A friend of mine had this exact problem too because a few random people connected to his Wi-Fi, even though he was using an ancient machine... Once he changed his password, everything fixed itself...
I don't see any other issue besides maybe needing to clean up your hard drive if it isn't new, or if you've swapped out multiple operating systems and it's just cluttered with junk... You can use CCleaner and use the drive wiper free space tool... You could do one pass, but it'll take a while given the size of your drive... I once cleaned my 250 GB drive with three passes and it took me the entire day...
I don't know any other way... maybe someone here knows a better method... It would probably be a good idea to install Norton Security and blow the dust out of your motherboard... But honestly, even with your current antivirus, you shouldn't be having trouble considering how strong your PC is... These are just my experiences and suggestions. Take care!