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My mouse lags very badly, when HDD activity happens. (I have Microsoft Desktop 6000 Wireless mouse)
Any ideas?

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You could buy an SSD! :D –  Phoshi Jul 25 '10 at 13:11
    
Funny comment, but might be true... Your hard disk might have worn out and thus causes a lot of interrupts. Does this also occur when you move the mouse around when your computer is idle? Do you see any weird behaviour in the Task Manager or the Resource Monitor? –  Tom Wijsman Jul 25 '10 at 16:40
    
No, I've checked my HDD and it's ok. And no, there are no any lags when PC is idle. Probably the problem is with some system resources sharing, but I don't know what to check. –  skevar7 Jul 26 '10 at 5:31
    
Any interference or anything which basically reduce signal anyway but its fine until hard load occurs? –  Shiki Jul 31 '10 at 6:32
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4 Answers

My solution was to buy a USB extender cable so the transmitter is placed further away from the PC case.

When there was a lot of activity on my HDDs, the mouse started lagging/stuttering. Anyone with this problem should give it a try. Could be your PC components interfering with the wireless USB mouse.

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You might have your hard drive in PIO mode. I say this because one of my friends had his hard drive in PIO mode and his mouse lagged all the time.

Download and run the registry fix mentioned here: http://winhlp.com/node/10

Let me know if this was your problem, I hope it is!

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My own solution to the problem of lag with wireless mouse, is not to use one.

If you want your mouse to be responsive under conditions of heavy use, use a USB mouse.

I just remark that a PS2 mouse is even more responsive, but very few computers today have the outlet.

(The above reflects my personal experience, and might not be valid for all computer/mouse/driver combinations.)

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Take a look at the Windows Device Manager. Look for any red flags/indicators on any of the device icons. Pay particular attention to the disk drives and controllers. A flag here could indicate a resource conflict or a driver problem. I'm not sure whether this is still the case with Windows 7, but in earlier Windows versions, when a 32-bit disk driver somehow failed, Windows would revert to a 16-bit generic driver and the result was terrible performance and weird effects such as you describe. The solution may be a matter of finding and installing the correct disk system driver for the affected component, which might be the motherboard.

How to access the Device Manager in Windows 7:
http://pcsupport.about.com/od/windows7/ht/device-manager-cm-windows-7.htm

It's also possible that it's a power-related issue. Disk access causes a spike in power use, potentially leaving peripheral devices (like a wireless USB mouse) with less power. But this is very unlikely; unless you have a lot of other power-hungry peripherals and/or an undersized power supply, it would tend to point to a faulty power supply.

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