Like the saying goes, "There is no such thing as a free lunch." Likewise, if you are looking into mainstream computing, there is no way to get a "free upgrade". (Microsoft says that if you got Vista with a free windows 7 coupon, then you get Windows 7 for free.)
Other than that, there is Linux, but one must be comfortable with computers and willing to take a dive into a different world of computing, where lots of things that were in windows and mac will be no longer.
You can't significantly.
There could be many reasons for a slow computer. Instead of spending a lot of money on a new computer/upgrade, you can try reading this eBook, which explains how to optimize your general PC performance: http://tinyurl.com/yar2oun
find a way to fool the computer
Just keep spending money and then you will get and upgrade.
You can buy one without an upgrade but it will cost you a lot more money
no where
upgrade complete and upgrade complete 2 it's also funny you should play it
You certainly can get virus protection without spending a lot of money. I would suggest the free software from Norton,www.Norton.com.
The cheapest and easiest way is to upgrade RAM. If money is no object, Upgrade RAM Motherboard and CPU.
download limewire
Your Back Garden.
You really can't.