tror ikke du skal slette $hf_mig$ hehe
The $hf_mig$ should *NOT* be removed.
<snip from the following KB Article>
When a security update, critical update, update, update rollup,
driver, or feature pack installs GDR version files, the hotfix files
are also copied to the %windir%\$hf_mig$ folder. This supports
migration to the appropriate files if you later install a hotfix or
service pack that includes earlier versions of these files. For
example, consider the following scenario:
1. You apply a security update that installs a GDR version of File.dll
with a version number of 5.2.3790.1000 and copies a hotfix version of
File.dll with a version number of 5.2.3790.1000 to the
%windir%\$hf_mig$ folder.
2. You apply a hotfix that includes a hotfix version of File.dll with
a version number of 5.2.3790.0000.
In this scenario the hotfix installation in step 2 installs the hotfix
version of File.dll (version number 5.2.3790.1000) from the
%windir%\$hf_mig$ folder instead of the hotfix version of File.dll
(version number 5.2.3790.0000) from the hotfix package.
Description of the contents of WinXP SP2 and Windows Server 2003
software update packages
http://support.microsoft.com/default.aspx?scid=kb;en-us;824994Jeg tror godt du kan slette $xpsp1hfm$
men så tror jeg ikke du kan afinstallere den update hvis du skulle få lyst til det senere.. mener nemlig det er en update folder.. og tror jeg også de fleste andre med $$ rundt om er.