To do this task
Check how much free space you have.
Open Windows Explorer.
Click My Computer.
Right-click the disk you want to check, and then click Properties.
The graphic on the General tab shows how much free space you have.
If you're low on free space:
Start the Disk Cleanup utility provided with Microsoft Windows, which will help you find and delete unneeded files.
Go to the Start menu and click Programs, then Accessories, then System Tools, and then Disk Cleanup.
Empty your Web browser's file cache.
Open the Web browser, then open its preferences.
For example, in Internet Explorer, go to the Tools menu, and then select Internet Options.
In the Web browser's preferences, find and use the function for deleting temporary Internet files.
For example, in Internet Explorer, in the General tab of the preferences, click Delete Files, and then click OK.
Back up unneeded or seldom-used files and then delete them from your hard drive.
Check the hard drive for errors.
Note: Windows may ask you to restart your computer before it can check the hard drive.
Click the Tools tab and then click Check Now.
Select options for how Windows should check the drive, and then click Start.
Try using QuickBooks again.
If you are still having problems, check the QuickBooks Support site on the Web or try the QuickBooks Community sites, where many special case situations are discussed by other QuickBooks users.