|You should disable any resident module(s) (a part that runs all the time Windows is running that is looking for suspicious activity) of anti-malware you have installed, BEFORE you install major software such as IE 7 or 8 (or SP3 updates, etc.). |
E.g. AVG 8.x free and paid versions, Spybot free and paid, Avast! free and paid, Norton / Symantec products free and trial, Malwarebytes paid, AdAware paid, all have at least one resident module.
Microsoft's Windows Defender has a resident module, but it doesn't seem to interfere with anything.
AdAware free, Malwarebytes free do not have a resident module.
If you don't know how to disable your resident module(s) for those, tell me (us) which anti-malware software you're using.
Once you've disabled that or those, if that applies, THEN you install IE 7 or 8 - IE should install fine.
Once you're sure IE works okay, enable any resident modules in those anti-malware programs that you disabled.
I'm using IE 8.x in XP and have not had any problems with it.
I'm using IE 6 SP2 in 98SE, the highest it can be in 98SE, and it does NOT work properly with some web sites these days.