Why is this process using my CPU so much, what is it doing in the secret? And how to fix this?
And I think it affects my other programs.
The Rundll and Rundll32 utility programs were originally designed only for internal use at Microsoft. But the functionality provided by them is sufficiently generic that they are now available for general use.
To see which DLL gets loaded, go to the
Details tab of Taskmgr, do a rightclick on the column header, click on
Select columns and activate commandline
Now look in comandline which DLL gets executed and if this is malware or legit Windows DLL.