Thank you, sp33di!

If you want to install an updated version, you do not necessarily have to uninstall the old one first.
If you want to be sure, however, just uninstall the old version (uninstall.cmd) and install the new one (install.cmd).
Reboots should not be necessary.

This program relies on byte patterns in order to find the right patch location.
As long as the known patterns keep working, Windows updates should be of no concern.
Defragmentation and registry optimizations shouldn't be problematic either unless they fail, of course.

After Windows' cursor acceleration has been patched, no third-party programs should be able to undo that.

Okay so now I took an picture about what it says when trying to load install bat. It loads something but at the end it says something about an error. Translated into english this means: "System error 31. Device contacted to system is not working." And here is an picture of it http://img104.imageshack....my.php?image=errorsk9.jpg
Im using windows xp with sp2 and all the windows updates downloaded. So I should propably load this one in safe mod?

Update 20080209
The bug outlined in this posting has been fixed.

The driver does not indicate failure (to enforce its immediate unload) anymore as it had previously led to confusion. It is still unloadable, but this has to be done manually:Since most data is either discardable or pageable, the memory footprint is very small.
This decision is not necessarily final.

In case of failure, error messages like the following one are now displayed at the logon prompt:
(http://img218.imageshack.us/img218/9479/i1ay9.th.png)

Awesome indeed, thanks aion!

This patch makes the mouse feel different than the older .exe accel fix. I prefer the feeling of the old accel fix. Tested in XP SP2 in RtCW and ET.

Use 7-Zip to extract the 7z archive to a temporary directory.
Run cmd.exe with administrative privileges, navigate to said directory and run install.cmd.

there is such a thing as a usbport.sys which makes everything go at 1000hz , but its been reported to damage usb devices which dont like to run that fast, like older mice and stuff...

one thing i simply do not understand is how does this mouse patch relate to simply unticking 'enhance pointer precision' in windows? i havent read the thread yet but i am reading it now

so like, this only matters for games which keep turning on mouse acceleration in windows? theres no cursor ballistics effects or whatever that people mentioned in this thread?