Source: http://zhidao.baidu.com/question/3947822.html
1. in Windows XP, ie cannot be reinstalled by default. You can use the following method to reinstall ie due to file errors or faults. Insert the Windows XP installation disc, and enter "rundll32.exe setupapi", "lnstallhinfsection defaultlnstall 132 c: \ windows \ INF \ IE. inf", and press enter to reinstall IE (assuming windows is installed in C: \ Windows)
Ii. 1. removed ie from the Control Panel
2. add, delete, and add windows components to the control panel. Find IE and uninstall it.
3. Find Internet Explorer under the c: \ Program Files \ directory to delete Internet Explorer
4. Delete the Registry
① To reinstall IE 5.0, follow these steps:
Step 1: Open Registry Editor, find [hkey_local _ machine \ Software \ Microsoft \ Internet Explorer], and click the version vector key.
Step 2: double-click the IE sub-key in the right pane, change "5.0002" to "4.0", and click "OK" to exit the "Registry Editor ".
Step 3: After the instance is restarted, You can reinstall IE 6.0.
② There are two methods to reinstall IE 6.0:
Method 1: Open Registry Editor and find [hkey_local _ machine \ Software \ Microsoft \ Active Setup \
Installed Components \ {89820200-ecbd-11cf-8b85-00aa005b4383}]. Change the DWORD Value of isinstalled to 0.
However, you must download ie6.0sp1 before uninstalling it.