Few bugs are as long standing as the svchost.exe Windows Update bug on Windows XP. Some sources have reported that the bug, in which the svchost.exe process suddenly takes up 100 percent of the CPU, has been known at least as far back as 2004.
Now, as the sun finally sets on the 12-year-old operating system, it looks like Microsoft will patch in a fix just in time for updates to end in April.