|"Vista home premium CD?"|
What about it? You wrote that in your orignal post that you have Windows 7, not Vista. - (Currently using- Windows 7). You also listed it as your OS (OS: Windows 7) & you selected it as a tag (Tags: windows 7, Crash, Games, pc, oblivion, freezing).
1GB RAM is not enough to run Vista or Win 7 decently, especially when a portion of that RAM is being used by the integrated Geforce 7200 graphics. What you should do is add more RAM, upgrade to a *real* video card & dump that garbage Optimizer program. Make sure your system is clear of viruses/spyware/malware & that you have no unnecessary programs loading at startup. Also make sure ALL your device drivers are up to date, especially the motherboard chipset & video. And you should check your CPU temp to make sure it isn't overheating under load.