hi there when the screen jumps when scrolling down this is normally for one of two reasons,the first is that there are either none or out of date graphic card drivers and in both cases the solution is to download the latest driver from your graphic cards manufacturers website however since you have not mentioned the name and model of your graphic card i cant give you a link for the drivers however since 90% of all graphic cards are either nvidia or a.t.i here are the links to their driver download web pages :nvidia : http://www.nvidia.com/Download/index.aspx?lang=en-...a.t.i drivers : http://ati.amd.com/support/driver.HTML using the appropriate link you can download the latest drivers and then after removing the old driver(wer applicable) you can then install the new driver also you may want to check the refresh rate as this can also affect the performance of your display,you can change your refresh rate by right clicking the desktop>properties>settings>advanced>monitor>then change the refresh rate to the desired setting,however make sure the box is checked that says" hide rates this monitor cannot support" as if you set the rate too high your monitor will become "out of range" and if this happens just wait and after 15 seconds the display will return back to its previous refresh rate defragging ...this is in laymans terms windows way of sorting out the files into a contiguous order,and this is done by either using the windows default defragmenter(start>programs>accesories>system tools>disk defragmenter) and then click defragement,the hard drive will then be analysed and then defragged,and depending on the degree of fragmentation this can take from 20 minutes up to 3 hours(or longer) however there are some excellent 3rd party defragementers with the most popular being "diskeeper" from http://www.diskeeper.com/,and the main reason for this is because it uses "invisitasking" which basically means you can continue with your work without the defragging affecting your pc.s performance,something that was impossible when using the windows defragger personally myself i use the "Auslogics Disk Defrag" from http://www.auslogics.com/disk-defrag,this is a excellent utility and it defrags my 320gb drive in less than 1 hour(after 3 months usage) however dont defrag your drive too regular,once a month should be enough,and less than this would be a waste of time this is because defragging puts a massive strain on your hard drive and too much of it can cause ireversible damage to the drive summary : download the latest video drivers to stop the jumping when scrolling,and defrag using the windows version or one of the two programs above any problems let me know good luck mate !...
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