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Right click on C drive and check how much free space left? how big is your hard drive?
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Right click on C drive and check how much free space left? how big is your hard drive?

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What do you mean wont respond? Does your computer lock up?
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What do you mean wont respond? Does your computer lock up?

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When I try to defrag my hardrive it won't respond. The drive is C:\<br />
My os is win xp media. I have a Dell xps 410 desktop computer. 
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When I try to defrag my hardrive it won't respond. The drive is C:\
My os is win xp media. I have a Dell xps 410 desktop computer. 

Defrag Harddrive

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.