Where are the Micrsoft Security Essentials definitions file located?
How can I check how much disk space Micrsoft Security Essentials occupies?
It differs depending on the OS. On my Windows 7 x64 machine, they are here:
C:\ProgramData\Microsoft\Microsoft Antimalware\Definition Updates
In XP, I believe that they will be found in the Documents and Settings branch under Application Data, but I dont have access to an XP machine at the moment.
The branch is protected.
On my machine that folder is about 260 megs in size.
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Do not delete that folder. MSE manages it on its own. Note that I mentioned that this location is protected -- removing it or emptying it might damage MSEs ability to protect the PC and/or update.
If you are that tight on space, you need to uninstall or remove something else or get a bigger drive. :-)
Mine may be bigger due to the fact that I'm running the beta and had been using v2 on this machine. I suspect that your folder size is more typical.