You might want to try a Sysinternal utility called psexec. You can find it here and Mocrosoft now owns them. I have used it for testing and it is far better than RunAs. Below is the URL you would use.
C:\WINDOWS\PsExec.exe -d -u lab\user1 -p user1 -i "c:\program files\internet explorer\iexplore.exe" //localhost/qlikview