Mala,
This is probably being caused by third party programs- malware/parasites.
From Control Panel> Internet Options> Advanced> uncheck "Enable third party
browser extensions." That should allow IE to work.
Download and run Run CWShredder from
http://www.spywareinfo.com/~merijn/downloads.html
CWShredder is only about 125 KB so it could be downloaded from another
machine onto a floppy disk if necessary.
Then download, install, *update* and run both of these programs:
Ad-aware from
http://www.lavasoft.de/software/adaware/
Spybot from
http://security.kolla.de/ (Remove items listed in red-others are
optional.)
Both programs should be updated after installation- before use.
Security tips and other information at:
Dealing with Unwanted Spyware and Parasites:
http://mvps.org/winhelp2002/unwanted.htm
You should re-enable browser extensions after the cleanup.
Don