B> Is there any way that I can prevent the system asking me for my
B> password each time I try to install new software?

No - it's a core security procedure and in fact until Windows came
along the need to enter passwords to make system changes was the
default. This ability to make kernel level changes at whim is one of
the core reasons Windows is in the mess it is with malware - UAC is a
sticking plaster over a compound fracture

In every day use the password isn't a problem and doesn't get in the
way - you aren't going to be installing things all the time !