I do not have Internet Explorer in my current system.
Currently using Mozilla Firefox 2.0. 
Download Mozilla Firefox here : http://www.mozilla.com/en-US/firefox/all.html
If you want a web broswer that has the most security features, get
Netscape Broswer: http://browser.netscape.com/ns8/ (Recommended for
advance users only)
What is wrong with IE6?
Internet Explorer 6
Internet Explorer 6 contains many issues that generate a large
amount of criticism. Most of these have been addressed in Internet
Explorer 7, but IE6 is still in widespread use.
Security
Much criticism towards Internet Explorer is related to concerns
about security: Much of the spyware, adware, and computer viruses
across the Internet are made possible by exploitable bugs and flaws
in the security architecture of Internet Explorer, sometimes
requiring nothing more than viewing of a malicious web page in
order to install themselves. This is known as a "drive-by
download": an attempt to trick the user into installing malicious
software by misrepresenting the software's true purpose in the
description section of an ActiveX security alert.
While Internet Explorer is not alone in having exploitable
vulnerabilities, its ubiquity has resulted in many more affected
computers when vulnerabilities are found. Microsoft has not
responded as quickly as competitors in fixing security holes and
making patches available. Not only are there more security holes
discovered in Internet Explorer, but these vulnerabilities tend to
remain unpatched for a much longer time, in some cases giving
malicious web site operators months to exploit them before
Microsoft releases a patch. Several companies maintain databases of
known security vulnerabilities that exist in Internet Explorer, for
which no fixes have been published by Microsoft. As of May 28,
2006, Secunia reports 104 vulnerabilities in Internet Explorer. 19
are unpatched, of which the most severe is rated "extremely
critical". In contrast, Mozilla Firefox, the main competitor to
Internet Explorer, is reported to have only 36 security
vulnerabilities. 3 remain unpatched, of which the most severe is
rated "less critical". Opera, another competitor to Internet
Explorer, has 1 vulnerability, which now is patched.
In May 2006, PC World rated Internet Explorer 6 the eighth worst
tech product of all time.
Standards support
Other criticisms, mostly coming from technically proficient users
and developers of websites and browser-based software applications,
concern Internet Explorer's support of open standards, because the
browser often uses proprietary extensions to achieve similar
functionality.
Internet Explorer supports, to some degree, a number of
standardized technologies, but has numerous implementation gaps and
conformance failures—some minor, some not—that have led to
criticism from an increasing number of developers. The increase is
attributable, in large part, to the fact that competing browsers
that offer relatively thorough, standards-compliant implementations
are becoming more widely used.
Internet Explorer's ubiquity, in spite of its inferiority in this
area, frustrates developers who want to write standards-compliant,
cross-browser code and the advanced functionality it provides,
because they are often stuck coding pages around Internet
Explorer's bugs, proprietary featureset, and missing standards
support instead.
Web developers must work with the least advanced technology across
all browsers they wish to support, and Internet Explorer is often
criticized for being technically obsolete. For a long-standing
concrete example, see Internet Explorer's poor PNG transparency
support.
Want to get more information about Internet Explorer? Please
visit: http://en.wikipedia.org/wiki/Internet_Explorer
I have not started using IE7 yet so no comments about it. But it
should be better than IE6.
