Thank you for helping, WoodyZ!
So if I get you right, I can use the remove-function
("I found an option to "remove" the virtual hard disk (right-click on the OS listed in VMware -> settings -> hard discs -> advanced options -> remove hard disc). Might this be useful? To remove it and create a new one which is smaller?")
and 'reinstall' the OSes without actually deleting the OSes? So basically I won't even need the WinXP \ Win7 discs to fix this? If so, how do I do that? Or will I have to delete the OSes and make a whole new copy of the Windows-files?
According to info in the support bundle the two VM are currently only sin less then 10 GB Host disk space when not running. When running an addition amount of space it temporarily used by the .vmem file for each VM in the size of the RAM allocated for each. This is then released when shutdown, not suspended.
This is really weird as I am currently not running any further OSes, not even VMware and the disk space is still as low as before. The virtual machines which are located in my documents-folder take about 10GB and when I say 40GB are "gone", I don't mean those 10GB. Bottom line, the whole installation of those virtual machines took 50GB of which 10GB are the virtual machines I can actually see as files and the 40GB for WinXP, whatever happened to those. The 60GB actually used for Win7 are not gone, even though. It's very confusing.
EDIT:
So basically, when it comes to RAM, the virtual machine backups the RAM in the .vmem files and the RAM itself is only used by WinXP\Win7 when its actually running? Or did I understand that wrong?