I would first check that your firewall and antivirus are not blocking the download. Make sure no other programs are running as something like using your audio could possibly stop a driver from installing. Most f the time though it's a person's antivirus program. Kaspersky and Norton are a bit zealous with their blocking of downloads. You could try disabling for a short period but don't web browse during the download.
Internet speed may be another factor but I have had no problems with the Magix servers recently.
[Edit] Just seen John beat me to replying and I agree disabling antivirus can be risky but it's your choice.
If you don't feel technically competent, then it's probably not a good idea.