hi,,,, if your worried about spyware,,, download this free program, update virus deff's then scan,,, its one of the best there is,, click on the link.
http://www.superantispyware.com/?tag=GOOGLE-SUPERANTISPYWAREas for not much memmory left, how much do you have, as it seems the sweet spot for vista is 2gig of RAM and when you look on task mannager there is'nt much left, this is because its been used by superfetch while your not using it, as soon as your system needs more RAM superfetch gives it back. here's a link that explains it all.
http://www.microsoft.com/windows/products/...erformance.mspxAs for excessive HDD usage, this is caused buy system restore being set too high by default, some times , like on my system its as high as 40gig, and also set to create restore points at will i think, here's a link to a fix for this aswell, as a guide to how much you should set it too, i halfed mine from 40gig used to 20gig used which returned 20gig of HDD space.
http://www.vista4beginners.com/System-Restore-Space-Usedhttp://forums.facepunchstudios.com/showthread.php?t=475489i posted 2 just incase,,,lol
good luck all