Hi. I'm running XP pro on a clean machine (regular scans with Avg, Adaware, Spybot, Regclean). Amd Duron 1000 MHz 512MB Ram Dual 80 GB Hard drives. After an earlier session of downloading application software, I started windows to find that Thunderbird froze on start up. The Tbird screen was there, but no contents. And CPU went to 100%, Task Manager said Tbird not responding. Most other applications ran as usual. Thinking Malware, I ran Adaware to find it also froze when scanning a reg key. Avg similar...froze when it reached Windows\system32\zprogbar.ocx. The programs seem to be running, but nothing changes for a LONG time. Same with Spybot. Then I noticed that if I tried to open system32 folder in MyComputer, explorer stops responding, cpu goes to 100%. So I can only think the prob is in system32 somewhere. Have uninstalled all recently downloaded software. Tried running RegCure but it also only got as far as system32\xmlprov1.dll then froze. If anyone has seen this behavior before would appreciate some ideas. Thanks!