BB Curve :: Run Incredibly SLOW And New Messages Cannot Be Viewed?

1. Quite a while ago (months) I had an email from RIM / blackberry whatever saying there was a software update (OS 5) and to follow the links to upgrade etc or use the wireless update on my phone - which just told me there were no new updates. After researching for a bit I found what I thought would allow me to get the OS software but I had to fill in 'company name' to continue (mandatory box to fill in) I'm just a student I have no company2. When I download specific apps my BB just buggers up totally, any theme not by RIM makes my BB run incredibly SLOW and new messages cannot be viewed despite the notification appearing. This has happened with apps such as paypal and subway card which you would think would work well.

This has even happened with the new spring themes from RIM - so I have to remove them as soon as downloading them. If this has happened to anyone else and has fixed this problem or has any knowledge of what I could so that would be amazingDevice info:carrier: Orange (UK)Model and OS: 8520, v4.6.1.314Apps and free spaceile free: 101429410 bytes
Did a battery pull fix your issue? NoApps installed and their version:core apps 4.6.1, system software 4.6.1app world 2.1.1.2, application centre 1.0.1.20, attachment service 4.6.1, maps 4.6.1, protect 5.0.2.12, brickbreaker 4.6.1, browser 4.6.1, copter 1.5, dictionary and thesaurus 1.4, docs to go 1.003.018, ebay 1.0.3.5, email setup app 4.6.1, facebook 1.9.0.28, falldown 1.4, google maps 4.5.2, help 4.6.1, klondike 1.4.8, localpedia 1.5.7133.46, memopad 4.6.1, myspace 2.0.0.33, password keeper 4.6.1, phone 4.6.1, skysports score centre 4.0, sudoku 1.0.11, tasks 4.6.1, tasks 4.6.1, texas hold 'em 2.3.0, twitter 1.1.0.21, virgintrain tickets 1.2.20, vuvuzela 1.0, windows messenger 2.5.69, word mole 4.6.1