Sudden spike in RAM & CPU usage with simple tasks (e.g. view()), allocate vector error, etc.

Hi I am new in R and so far I have been working with large sets of data doing simple tasks. Everything was fine until yesterday when I have started receiving errors such as "allocate vector errors...", in addition of my CPU and memory spiking (task manager), computer fun running like crazy etc.
I have already done several installations of R and Rstudio (3 times), I have also tried to reduce the file (.csv) size, etc. and even using suggestions from blogs such as memory.limit() and rm(list = ls()).
Nothing works...I have tried reading blogs but I don't have much experience, so feel very frustrated and useless.
Any help, please?

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