No need to uninstall ccleaner.Yes im sure ie 6 will be restored.Make a restore point before you uninstall ie 7,at least then if you have any probs you can just restore to that point without losing any previous data.
terryf is right. just use add/remove programs and it will roll back to IE6. I am with IE7 now but I did do an uninstall right at the beginning and IE6 appeared.
But, consider this, Microsoft say
"If you are having problems with Internet Explorer 7 hanging, crashing, silently closing or other bizarre behaviour, an incompatible tool bar or other add-on maybe involved. The fastest way to determine if an add-on is causing the problem is to run Internet Explorer 7 with no add-ons. You can do this by going to Start, clicking All Programs, click Accessories, click System Tools and click Internet Explorer (No add-ons). This disables all add-ons from loading in that instance of Internet Explorer. If the problem goes away, you can manually disable specific add-ons to find the specific one causing the problem. Below are instructions on how to manually disable a specific tool bar and a list of known incompatible tool bars that can cause serious issues with Internet Explorer 7.
To disable a tool bar open Internet Explorer 7, follow these steps:
In Windows, click the Start button. Click All Programs. Click Accessories. Click System Tools and then click Internet Explorer (No add-ons). Once you determine the tool bar causing the issue, you should uninstall the tool bar through Add or Remove Programs in Windows Control Panel and then check the tool bar’s website for an updated version.2
Thanks guys. Have started running IE with no add-ons and will see what gives. Some of the apps I run 'need' add-ons so as you say I'll wait and see which ones give me the problem. Will report back later....