I'm having the same problem, if you find out what it is, could you please tell me?

Have you tried a defrag?

Everytime I scan my computer for viruses then try to defrag, it tells me I don't have
to defrag my computer, should I defrag anyway?

CDLOU3,

Thank you for using the Dell | Talk forum.

You may too many applications running in the background.
Try stopping all background applications.
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**Clearing the Startup Folder.**

Click on (Start,Programs,)
Find the (Startup) folder, and right click the mouse button over it.
You should get a small gray windows.
Go down to "Explore" and left click on "Explore"
You should get a "Startup" window that is split in two.
High light and delete all the icons on the right hand side of the Window.

**Using MSconfig to stop all background programs.**

Left-click on START | RUN.
Type in "msconfig" in the "Open" dialog box and left-click on "OK."
When the "System Configuration Utility" window appears, the "General" tab will be visible. Left-click on "Selective Startup."
Remove the check marks from each choice except "System.ini," by left clicking on the check marks.
Click the Startup tab.
Uncheck every entry.
Left-click on "Apply" and then left-click on "OK."
A message will appear stating that "For the changes to take place, the system must be restarted." Left-click on the "OK" button, and the system will begin the restart.

If the problem stops, then try using the steps below, to isolate the program that
is causing the problem.
Repeat the first couple steps above, but instead of un-checking the entries, re-check one entry at a time until you have identified the category that is the cause of the problem. After you have isolated the application, utility, or device driver that is causing the problem, you will be able to proceed with further troubleshooting. One of the easiest methods to attempt a resolution is to reinstall the problematic application or device driver. The entry causing the problem can be left disabled if it does not affect system operation.

**Delete old dos/legacy configuration files.**

Search the system for these files, delete them.
Autoexec.bat
Config.sys
Win.ini
-Delete "All" the files and folders in the ( C:\Windows\Temp ) and
( C:\Windows\Temporary Internet Files ) folder.
Search the system for any ( *.TMP ) files, and delete them.