I have a WinXP SP3 installation modified by nLite. This particular installation was stripped off the QoS Packet Scheduler. I was advised to remove QoS because of the overhead it produces or something like that.

Now, I read this lifehacker post about windows maintenance, and it says that on the contrary, by doing so I may have done more harm than good:

Disabling QoS in Windows XP: Rumor had it that Microsoft had permanently tied up 20 percent of your net bandwidth for Windows Update. They didn't, and those who disable QoS, or IPv6, in XP actually end up with some pretty harsh connectivity problems.

I tend to believe this, and now I seek a way to reinstall QoS. I tried to install it by going to network adapter properties -> install -> service, but there is no QoS there.

I have the original, untouched WinXP SP3 cd.

So, is there a way to bring back QoS into my WinXP installation, preferably without reinstalling windows from scratch?