For about a week, I thought my EpsonScan driver was broken: whenever I selected a folder to dump my batch scans, it would just hang there on the “Browse for Folder” dialog box.
Then I noticed the same problem in NikonScan…, Picasa… and Thunderbird.
Suspicious, huh? I rummaged around and noticed that Windows Update had installed four patches about a week ago. I bit of googling suggested KB908531 might have been the culprit. So I uninstalled KB908531 through the Add/Remove Programs feature in Control Panel and ta da! my computer is usable again.
BTW, you should read [Microsoft's knowledgebase article](http://www.microsoft.com/technet/security/Bulletin/MS06-015.mspx) before you uninstall the patch. Since those are the primary applications for my computer at home, I’ll be living (dangerously) without the patch until they fix it properly.