Hmmm, I have encountered this problem occasionaly on this computer the one with Internet explorer on it (dad wont let me DL FF on this comp>.<). Its not too much of a problem however, and usually goes away.
@BFH IE7 is for people to lazy to DL Fire Fox, the only TRUE internet browser. Hell, people in my school DL FF to get past the site blocker and now the teachers are getting pissed hehehe.