Hello Stigmatas, welcome to PCHF!
Depending on your motherboard (if you know the make and model of your motherboard, otherwise you can find out using
SIW Download), you should be able to upgrade to a gig. Any more than that, then you will be looking at buying a new motherboard and memory. .Not really worth all that IMHO Stig, since PC prices are so cheap these days, you can pickup an Inspiron base unit from Dell at only $350!