My system is slow and also hanging - Compaq Computers & Internet

Press windows button and in the search type msconfig go to startup tab and uncheck those you dont want to start. scroll to the bottom toolbar bottom of screen right click you can select task manager applications also processes you will see whats running on your computer and ticking over you might have a virus http://www.majorgeeks.com/Microsoft_Security_Essentials_for_Windows_d6242.html microsoft security essentials your operating system must be registered Win7/Vista/XP 64 bit http://majorgeeks.com/downloadget.php?id=4281&file=1&evp=dbb3b0aebe6a6a4ff18089a6489a5e62 anti malware free edition Win XP/2003/Vista/Windows7 if you see something running that you does not need to be running select end now then you might you might uninstall that particular program and some unnecessary programs you should also check leads from motherboard to hard drive for secure dust free connections click start control panel administrative tools computer management disk management right click on your drive select properties click tools you should see click check now click start tick in both boxes this will schedule to on restart do not have any input while chkdsk utility is in progress any might damage your computer also you might download and use this registry cleaner it is totally free to use http://download.cnet.com/ccleaner/ then defragment your hard drive adding more ram is the best way of speeding up a computer If youre not sure if a module is right for your system use the Crucial Memory Advisor tool for a list of guaranteed compatible modules
you should always ask for a guarantee on compatibility before purchasing any ram and buy working pairs if possible you might have to many programs running at the same time putting to much strain on the CPU central processing unit
try uninstalling a few unnecessary programs This tool deletes unnecessary or temporary files on your hard disk so you can increase the amount of storage space you have. Delete the files using Disk Cleanup If you want to reduce the number of unnecessary files on your hard disk to free up disk space and help your computer run faster, use Disk Cleanup. It removes temporary files, empties the Recycle Bin, and removes a variety of system files and other items that you no longer need. Open Disk Cleanup by clicking start all programs accessories system tools and then clicking Disk Cleanup. In the Disk Cleanup Options dialog box, choose whether you want to clean up your own files only or all of the files on the computer. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. If the Disk Cleanup Drive Selection dialog box appears, select the hard disk drive that you want to clean up, and then click OK. Click the Disk Cleanup tab, and then select the check boxes for the files you want to delete. When you finish selecting the files you want to delete, click OK, and then click Delete files to confirm the operation. Disk Cleanup proceeds to remove all unnecessary files from your computer. This tool deletes unnecessary or temporary files on your hard disk so you can increase the amount of storage space you have. Delete the files using Disk Cleanup If you want to reduce the number of unnecessary files on your hard disk to free up disk space and help your computer run faster, use Disk Cleanup. It removes temporary files, empties the Recycle Bin, and removes a variety of system files and other items that you no longer need. Watch the demo (1:00) this should speed up your computer
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Hope this helps.