Getting Windows Error Message When Surfing

In IE7 (Windows XP-sp2 Dell 3000 Intel Celeron D-330)Kept getting Windows Error message when surfing, saying Windows has caused an error and has to close then given choice of sending report.Also had problems with hyperlinks in IE, only showing blank page, or sometimes nothing at all happens when I click on a link.
So I did a uninstall/reinstall of IE6-sp2. Then downloaded IE7 from Microsoft, downloaded C-Cleaner, and AVG anti-virus. No viruses or malicious targets have been detected. Attempted to download AdAware but Windows said it was not a valid WIN32 application. Now, I get continual "Runtime Error" messages, asking "do I want to debug?" Have run a few registry keys per Bob Cerelli's notes, and "regsvr32 msjava.dll" failed. Also "regsvr32 mshtml.dll" loaded, but entry point could not be found. I have tried to set the ActiveX compatibility in the registry, but ActiveX is not listed in the registry keys.The only quick fix I found for IE does not support IE7.