Only one thing. Don't delete the cookies in the temp internet files folder. You can, but if you do, the internet will "forget" your passwords and you'll have to enter them again. But other than that pain, there's nothing to worry about. 
First off; this statement went right over my head. Though I generally keep a hand written list of passwords; if you could ellaborate some; as I'd like to understand the context.
Being a newbie; I some how, lost a reply I'd spent a couple hours forming; in lue of this, I'll try to make this short.
Also, I should hope my reply is appropriate to this post.
I recently installed Ccleaner; I find it an essential tool for keeping the pointless clutter on my PC to a minimum.
In addition I've been told it's also possible to use the run box entering %temp%
or; rather using windows search option
entering *.tmp,*.chk,~*.* to reveal even more temporary file which can I'm told be removed safely.
I first ran Ccleaner then after emptying the recycle bin and restarting the machine; I searched Windows using *.tmp,*.chk,~*.* and found many more temporary files.
I believe this is related to the subject; it is widely recommended; to set Windows to show hidden and protected files; as when scanning for maleware.
The way I understand this is showing hidden files enables Ccleaner and other programs as Ad aware and SpyBot to scan areas of the PC which would not otherwise be scanned.
I can understand Windows protecting files from inexperienced users like myself; but why should Windows block useful programs from accessing those files or protect temporary files at all?
