Okay, IE 7 shouldn't have anything to do with it. However, I would double check your security settings within your browser and also check the settings with your AntiVirus software. Often times, AntiVirus programs will require to to grant programs "permission" to access the internet via a hyperlink within that program. I.E. your friend sends you a hyperlink in MSN messenger, however you are unable to access the link in a new window. If you grant permission for MSN messenger to open links, you should be good to go.
I hope this helps, and if you give it a shot and have no luck, let me know and we'll try something different.
Good Luck!