Upgraded to CS5, can we uninstall CS4?

Hello, just installed CS5 upgrade and assumed it would replace CS4 on our system.  It appears to have installed as a completely new program and left the original CS4 installation in place.
Q. Can we uninstall the CS4 version to reclaim some HDD space?  CS5 seems to be working fine?
The screen shot belows shows the programs listed on the 'start' menu.
edit: We received the upgrade disk from Adobe as we had purchased CS4 after CS5 was announced for release.  Both program disks have different serial numbers.

Update for others who may read this....
There is one "ill-effect" that we have since discovered which relates to LR3.
We installed LR3 after CS5 and later removed the previous installation of CS4.  This action removes a key in the registry which makes the "Edit in Photoshop" option greyed out on the menu bar.
The solution was eventually found here:
http://kb2.adobe.com/cps/401/kb401629.html
We chose to have a go at the registry edit, but apparently re-installing CS5 will replace the key also, (this option may be tedious for those who have installed lots of plug-ins?).

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