R Studio 3.5 errors and Reverting to previous version 3.3

rmarkdown
rstudio

#1

Hello,

I recently installed the latest version of R on my computer, and was successfully using it for quite some time. I tried to open R Studio today on my computer and not only do I get the error messages below, but it seems that R Studio is reverting back to a previous version, 3.3. I can't seem to do anything with my R Studio like this- any help is greatly appreciated!

Error in get0(oNam, envir = ns) : 
  lazy-load database 'C:/Users/mfeene/Documents/R/win-library/3.3/yaml/R/yaml.rdb' is corrupt
In addition: Warning message:
In get0(oNam, envir = ns) : internal error -2 in R_decompress1
Error in get0(oNam, envir = ns) : 
  lazy-load database 'C:/Users/mfeene/Documents/R/win-library/3.3/yaml/R/yaml.rdb' is corrupt
In addition: Warning messages:
1: In get0(oNam, envir = ns) : restarting interrupted promise evaluation
2: In get0(oNam, envir = ns) : internal error -2 in R_decompress1
Error in get0(oNam, envir = ns) : 
  lazy-load database 'C:/Users/mfeene/Documents/R/win-library/3.3/yaml/R/yaml.rdb' is corrupt
In addition: Warning messages:
1: In get0(oNam, envir = ns) : restarting interrupted promise evaluation
2: In get0(oNam, envir = ns) : internal error -2 in R_decompress1
Error in get0(oNam, envir = ns) : 
  lazy-load database 'C:/Users/mfeene/Documents/R/win-library/3.3/yaml/R/yaml.rdb' is corrupt
In addition: Warning messages:
1: In get0(oNam, envir = ns) : restarting interrupted promise evaluation
2: In get0(oNam, envir = ns) : internal error -2 in R_decompress1

#2

Firstly, just to clarify the distinction between R and RStudio (Differentiating R from RStudio)

When do these errors appear? And what version of R appears when you open just R-application (not RStudio)?

Sometimes, system information is helpful too:

Some system Information could be useful as well

#### System Information:
- RStudio Edition: (Desktop or Server)
- RStudio Version: 
- OS Version: 
- R Version: 

#### Also:
<!-- Depending on your issue, the following may be useful /-->
<!-- If a section isn't relevant or you can't collect it just delete that section below /-->
- RStudio diagnostics report: <!--see rstd.io/support-diagnostics-report /-->
- Your `sessionInfo()`:
- RStudio crash report: <!-- rstd.io/support-crash-report /-->
- RStudio application log files: <!-- rstd.io/support-ide-log-files /-->

The first suggestion I'd make is to