unfortunately pressing the button only makes it worse it should be absolute last resort use ctrl+alt+delete to open task manager and try to stop the things using up allot of memory aim yahoo a browser internet explorer firefox chrome whatever you see that you know you installed you can safely stop
as far as the beep you here it's probably from your system warning you of low resources memory etc
you do have more that just a virus and unless you used a cd and did a clean system restore or destructive system restore as it's called the ad-ware malware spyware root kits servers every possible horrible thing you don't want is probably on your computer my suggestion try to move personal files text files photos videos anything that's irreplaceable to a cd or usb flash drive once it's off your computer you can then do the same thing you did before but instead of non destructive system restore you have to hope it's not all infected and go for the full destructive system restore if it doesn't have that option or if that's what you did you are going to have to get a disc that's a disk that came with your computer hopefully or find a used factory disc for your make and model of pc and use it to fully re-install there's no way the disk is going to be infected so try that if you don't mind a challenge you could download on a friends computer http://www.ubuntu.com/download/ubuntu/download
and burn it to cd or to usb flash drive don't just copy it use an iso burner for cd and unetbootin for usb http://www.imgburn.com/index.php?act=download
http://unetbootin.sourceforge.net/
i suggest you read a good bit about linux before switching ubuntu is the most windows like it's user friendly with huge community and forum it's 100% better than windows you'll never go back if you like it if you don't mind change doing things a little different and it's more secure than windows so that's my advice find someone with some computer savvy at your school or search local linux groups that can help
if you want the week long challenge of cleaning out the junk it may not be possible but you can start by going and saving personal files on disc or usb flash thumb drive
then go to start control panel ad remove programs most of these you installed so you can easily without harming anything delete all of these skip ones that say hp or microsoft or ms skip drivers and service packs sp1 sp2 sp3 hotfixes anyway you can delete allot here and it's nothing that's so crucial it will destroy your system but delete what you feel comfortable deleting then d/l
http://download.cnet.com/ccleaner/?tag=pop and http://download.cnet.com/CCEnhancer/3000-18512_4-75212385.html
run these using all the settings except wipe free space when it asks back up the registry save to desktop then downloading most of these start with http://download.cnet.com/Comodo-Firewall/3000-10435_4-75181464.html?tag=dropDownForm;productListing
then http://download.cnet.com/windows/security-software/?tag=rb_content;main
go down the left side skip corporate software and encryption for now and you have comodo firewall from above so no need for another anyway download a couple anti virus a couple from every category or several pieces from some sections
install and update these pieces of software install one update it then here comes the main part you have to run the software in safe mode turn off comp and press f8 when you turn it back on it should give you a few options choose safe mode use up and down arrow keys to choose then hit enter
do this routine install each piece of software update it then go back to safe mode run the software then move to the next you can speed up your pc after this is done by stopping unnecessary programs http://www.blackviper.com/category/guides/windows-xp/