S510p touch screen will start wigging out and you can move pointer or other part of screen.

run it in battery to see if fixes cursor problem
also try a different mouse see if that makes the cursor move correctly
this way you see if its the mouse or power supply
might also a touch pad problem anything that controls the cursor

TRY TO UPDATE DRIVERS

Step 1

1. Open Mouse by clicking the Start button, clicking Control Panel, clicking Hardware, and then clicking Mouse.
2. Click the Pointer Options tab, and then do any of the following:

• To change the speed at which the mouse pointer moves, move the Select a pointer speed slider towards Slow or Fast.
• To make the pointer work more accurately when you're moving the mouse slowly, select the Enhance pointer precision check box.
• To speed the process of selecting a choice when a dialog box appears, select the automatically move pointer to the default button in a dialog box check box.
• To make the pointer easier to find when you move it, select the Display pointer trails check box, and then move the slider towards Short or Long to decrease or increase the length of the pointer trail.
• To ensure that the pointer doesn't block your view of the text you're typing, select the Hide pointer while typing check box.
• To find a misplaced pointer by pressing the CTRL key, select the Show location of pointer when I press the CTRL key check box.

Change mouse settings
http://windows.microsoft.com/en-US/windows7/Change-mouse-settings

Step 2

If you are using touchpad, try reducing the Touchpad sensitivity and check

1. Click on the "Start" icon in the lower left corner of the screen. Select "Control Panel." Next select "Mouse" under "Hardware and Sound." You can also left-click the touchpad while the cursor is anywhere on the desktop. From that screen, choose "Mouse Pointers."
2. Select the "Buttons" tab at the top of the dialog box that opens. This shows the type of touchpad device installed on your laptop.
3. Set the touchpad for right or left-handed use from this dialog box. You can adjust the double click speed of your computer as well. When you finish making any changes, click "Apply."
4. Pick the "Device Settings" tab from the dialog box now. You can see the touchpad for your Vista machine highlighted on this screen. Select "Settings."
5. Read the information provided in the next dialog box. It gives you options for tapping your touchpad, using the buttons, scrolling, pointer motion and sensitivity.
6. Make any changes you want from the various topics. When you make a change, click "Apply." Click "OK" when you finish making all your changes.
7. Do some work on your computer for a while, If the touchpad is still too sensitive, return to the "Mouse" menu and continue to adjust the settings until you get them just the way you want them.

Step 3

If the issue persists try to perform a clean boot and check whether the issue is still persists.

Follow the steps mentioned in the article given below.

How to configure Windows Vista to start in a "clean boot":

http://support.microsoft.com/kb/929135

Note:Once the troubleshooting is over, reset the computer to start as usual.

Also I would suggest you to keep in touch with mouse manufacturer

Step 1

1. Open Mouse by clicking the Start button, clicking Control Panel, clicking Hardware, and then clicking Mouse.
2. Click the Pointer Options tab, and then do any of the following:

• To change the speed at which the mouse pointer moves, move the Select a pointer speed slider towards Slow or Fast.
• To make the pointer work more accurately when you're moving the mouse slowly, select the Enhance pointer precision check box.
• To speed the process of selecting a choice when a dialog box appears, select the automatically move pointer to the default button in a dialog box check box.
• To make the pointer easier to find when you move it, select the Display pointer trails check box, and then move the slider towards Short or Long to decrease or increase the length of the pointer trail.
• To ensure that the pointer doesn't block your view of the text you're typing, select the Hide pointer while typing check box.
• To find a misplaced pointer by pressing the CTRL key, select the Show location of pointer when I press the CTRL key check box.

Change mouse settings
http://windows.microsoft.com/en-US/windows7/Change-mouse-settings

Step 2

If you are using touchpad, try reducing the Touchpad sensitivity and check

1. Click on the "Start" icon in the lower left corner of the screen. Select "Control Panel." Next select "Mouse" under "Hardware and Sound." You can also left-click the touchpad while the cursor is anywhere on the desktop. From that screen, choose "Mouse Pointers."
2. Select the "Buttons" tab at the top of the dialog box that opens. This shows the type of touchpad device installed on your laptop.
3. Set the touchpad for right or left-handed use from this dialog box. You can adjust the double click speed of your computer as well. When you finish making any changes, click "Apply."
4. Pick the "Device Settings" tab from the dialog box now. You can see the touchpad for your Vista machine highlighted on this screen. Select "Settings."
5. Read the information provided in the next dialog box. It gives you options for tapping your touchpad, using the buttons, scrolling, pointer motion and sensitivity.
6. Make any changes you want from the various topics. When you make a change, click "Apply." Click "OK" when you finish making all your changes.
7. Do some work on your computer for a while, If the touchpad is still too sensitive, return to the "Mouse" menu and continue to adjust the settings until you get them just the way you want them.

Step 3

If the issue persists try to perform a clean boot and check whether the issue is still persists.

Follow the steps mentioned in the article given below.

How to configure Windows Vista to start in a "clean boot":

http://support.microsoft.com/kb/929135

Note:Once the troubleshooting is over, reset the computer to start as usual.

Also I would suggest you to keep in touch with mouse manufacturer

Use the touch pad to move the pointer around the screen.
Run your finger over the touch pad in the direction you want the pointer to move and then click the left touch bar (this works as the left button on a mouse).

click start button in lower left hand corner, then a pop out menu will come up, click control panel, then find mouse, click it, then go to pointer options and click it, see if theres a box checked that says something like (automatically move pointer to the default button in a dialog box). uncheck that box......hope this helps you.......

Try cleaning the screen with a soap and water rag and allowing to completely air dry then re-calibrate

This could happen if the PS/2 connector on the motherboard is defective, or if there is a failing component in the PS/2 circuitry on the motherboard.
Could also be due to loose solder points at the PS/2 connector.
This needs to be checked by a qualified technician.

here's my guess =)

maybe you have the mouse pointer option set to Display pointer trails? if this is the case... this is the solution.

• go to control panel: START > SETTINGS > CONTROL PANEL
• select mouse
• go to Pointer Options
• look for Visibility section
• uncheck Display pointer trails

In windows xp go into start menu, then into control panel then click on appearance and themes, then move your mouse over to mouse pointers click on it , uncheck "enhance pointer precision, and click apply, that will stop the mouse from acting crazy, this will work with dell mouse pointers and most.